Geometry Word Search PDF for Units From Angles to Proof

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Name Date

Geometry Word Search

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0 of 16 words found

PIOYDKYTPREESBP

PNNPTNOARWRSPNG

EIRAUCIRCLEEATI

RTNCAHOXAIIDRDT

IRTUUDXPGPTNAEG

MLYTRKIDOOUALOA

EBPERPENDICULAR

TBATSDTSNNCEENE

ETNFEIIISTHULRA

RVGRBARMKRDSOSS

ADLDAMGITAUXTYQ

SVERTEXLIDDLCFU

OFXGNTAAYIBOODA

WSYMMETRYUSMNIR

PROOFRROCSHLINE

This grid is wider and taller than its box. Slide it to see every letter.To drag, hold the first letter for a moment, then slide.Keyboard: Tab to the grid, arrow keys to move, Enter on the first and last letter.

PointPOINT
LineLINE
ParallelPARALLEL
PerpendicularPERPENDICULAR
AngleANGLE
VertexVERTEX
AcuteACUTE
SimilarSIMILAR
SquareSQUARE
CircleCIRCLE
RadiusRADIUS
DiameterDIAMETER
SymmetrySYMMETRY
AreaAREA
PerimeterPERIMETER
ProofPROOF

16 of 24 words from the Geometry Key Terms list.

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Answer key: Geometry Word Search

PIOYDKYTPREESBP

PNNPTNOARWRSPNG

EIRAUCIRCLEEATI

RTNCAHOXAIIDRDT

IRTUUDXPGPTNAEG

MLYTRKIDOOUALOA

EBPERPENDICULAR

TBATSDTSNNCEENE

ETNFEIIISTHULRA

RVGRBARMKRDSOSS

ADLDAMGITAUXTYQ

SVERTEXLIDDLCFU

OFXGNTAAYIBOODA

WSYMMETRYUSMNIR

PROOFRROCSHLINE

POINT, LINE, PARALLEL, PERPENDICULAR, ANGLE, VERTEX, ACUTE, SIMILAR, SQUARE, CIRCLE, RADIUS, DIAMETER, SYMMETRY, AREA, PERIMETER, PROOF

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All 167 words

Lines and Angles 24

Acute Less than 90 degrees. A triangle whose 3 angles are all like this gets the name too.
Adjacent Next to each other: two angles that share a vertex and a side but do not overlap.
Angle Two rays that share an endpoint make one. It is measured in degrees.
Bisect To cut into two equal parts.
Complementary Two angles that add up to 90 degrees.
Coplanar Lying in the same plane.
Degree The unit for measuring angles. A full turn has 360.
Intersect To cross or meet, the way two streets do at a corner.
Line A straight path that goes on forever in both directions.
Obtuse More than 90 degrees but less than 180. A triangle with one such angle gets the name too.
Parallel Always the same distance apart, so they never meet, like railroad tracks.
Perpendicular Meeting at a right angle, like the two strokes of a capital T.
Plane A flat surface that goes on forever in every direction.
Point An exact location with no size, shown as a dot and named with a capital letter.
Protractor A half-circle tool for measuring and drawing angles.

Show all 167 words (152 more)

Lines and Angles, continued

Ray Part of a line with one endpoint that goes on forever in one direction.
Reflex More than 180 degrees but less than 360.
Segment The part of a line between two endpoints.
Skew Two lines in space that never meet and are not parallel.
Straight Exactly 180 degrees, so the angle looks like a line.
Supplementary Two angles that add up to 180 degrees.
Transversal A line that crosses two or more other lines.
Vertex The corner where two sides of a shape, or the two rays of an angle, meet.
Vertical Straight up and down. Also the name for the equal angles across from each other at an X.

Triangles 21

Altitude A segment from a vertex straight to the opposite side, meeting it at a right angle.
Apex The highest point of a figure, such as the tip of a pyramid or the top of a triangle.
Base The side or face a figure is thought of as standing on. Height is measured from it.
Centroid The balance point of a triangle, where its 3 medians cross.
Circumcenter The point where the perpendicular bisectors of a triangle's 3 sides cross.
Congruent Exactly the same shape and the same size.
Equiangular Having every angle the same size.
Equilateral Having every side the same length.
Exterior Outside. An angle between one side of a polygon and the next side extended has this name.
Hypotenuse The longest side of a right triangle, across from the right angle.
Incenter The point where the 3 angle bisectors of a triangle cross.
Interior Inside. The 3 angles on the inside of a triangle have this name.
Isosceles Having at least 2 equal sides. Used of triangles.
Leg Either of the two sides of a right triangle that meet at the right angle.
Median A segment that joins a vertex of a triangle to the midpoint of the opposite side.
Orthocenter The point where the 3 altitudes of a triangle cross.
Pythagorean The theorem with this name says a² + b² = c² for the sides of a right triangle.
Scalene Having 3 sides of 3 different lengths. Used of triangles.
Side One of the straight segments forming a polygon.
Similar The same shape but not always the same size: equal angles and sides in proportion.
Triangle A polygon with 3 sides. Its 3 inside angles add up to 180 degrees.

Polygons and Quadrilaterals 21

Apothem The distance from the center of a regular polygon straight to the middle of a side.
Concave With a dent: at least one inside angle of the polygon is greater than 180 degrees.
Convex With no dents: every inside angle of the polygon is less than 180 degrees.
Decagon A polygon with 10 sides and 10 angles.
Diagonal A segment joining two corners of a polygon that are not next to each other.
Heptagon A polygon with 7 sides and 7 angles.
Hexagon A polygon with 6 sides. Regular ones cover a floor with no gaps.
Kite A quadrilateral with 2 pairs of equal sides that are next to each other.
Nonagon A polygon with 9 sides. The name mixes the Latin for nine with Greek.
Oblong A rectangle that is longer than it is wide, so not a square.
Octagon A polygon with 8 sides and 8 angles.
Parallelogram A quadrilateral with 2 pairs of parallel sides.
Pentagon A polygon with 5 sides and 5 angles.
Polygon A closed flat shape with straight sides. The name is Greek for many angles.
Quadrilateral Any polygon with 4 sides and 4 corners. Its inside angles add up to 360 degrees.
Rectangle A quadrilateral with 4 right angles.
Regular Having all sides equal and all angles equal. Used of polygons.
Rhombus A quadrilateral with 4 sides of equal length, like a pushed-over square.
Square A quadrilateral with 4 equal sides and 4 right angles: a rectangle and a rhombus at once.
Tangram A Chinese puzzle: a square cut into 7 pieces that are put together to make pictures.
Trapezoid A four-sided shape with one pair of parallel sides. In Britain it is called a trapezium.

Circles 19

Annulus The ring-shaped region between two circles that share a center.
Arc Any unbroken piece of a circle.
Center The point inside a circle that is the same distance from every point on it.
Chord A segment with both endpoints on a circle.
Circle Every point on this round curve is the same distance from the center.
Circumference The distance around a circle: pi, about 3.14, times the diameter.
Circumscribe To draw a figure around another so that it touches every corner of the inner one.
Compass A V-shaped tool with a sharp point on one leg and a pencil on the other, for drawing circles.
Concentric Having the same center, like the rings of a target.
Diameter A chord through the center: the longest one a circle has.
Ellipse A stretched circle: the closed curve made when a plane slices a cone at a slant.
Inscribe To draw one figure inside another so that every corner touches the outer figure.
Oval A shape like an egg or a stretched circle.
Quadrant A quarter of a circle, or one of the 4 regions the x and y axes divide a plane into.
Radian An angle unit of about 57 degrees: the arc it cuts off is as long as the radius.
Radius A segment from the center of a circle to any point on it. Half the diameter.
Secant A line that cuts through a circle at two points.
Sector A pizza-slice region between two radii and the arc that joins them.
Tangent A line that touches a circle at exactly one point.

Solid Figures 21

Cone A solid with a circular base that narrows to a single tip.
Cross section The flat shape you see when a plane slices straight through a solid.
Cube A solid with 6 square faces, 12 edges and 8 corners.
Cuboid A box shape: a solid whose 6 faces are all rectangles.
Cylinder A solid with two parallel circular ends joined by a curved surface, like a can.
Dodecahedron A polyhedron with 12 faces. The regular one has 12 regular pentagons.
Edge The line where two surfaces of a solid meet. A cube has 12.
Face A flat surface of a solid. A cube has 6.
Frustum What is left of a cone or pyramid when the top is sliced off parallel to the base.
Helix A 3-dimensional curve that winds around a cylinder or cone, like a spring.
Icosahedron A polyhedron with 20 faces. The regular one has 20 equilateral triangles.
Net A flat pattern of joined polygons that folds up into a solid. A cube has 11 different ones.
Octahedron A polyhedron with 8 faces. The regular one has 8 equilateral triangles.
Polyhedron A solid with flat polygon faces, with straight edges and sharp corners.
Prism A solid with two matching parallel ends and sides that are parallelograms.
Pyramid A solid with a polygon for a base and triangular faces that meet at one point.
Solid A figure with 3 dimensions: length, width and height.
Sphere A perfectly round ball: every point on its surface is the same distance from the center.
Tetrahedron A polyhedron with 4 faces. The regular one has 4 equilateral triangles.
Torus A surface shaped like a doughnut.
Volume The amount of space a solid takes up, measured in cubic units.

Transformations and Symmetry 19

Clockwise In the direction the hands of a clock move.
Dilation A resizing from a center point by a scale factor. More than 1 enlarges the figure.
Enlarge To make a figure bigger while keeping its shape.
Flip To turn a figure over across a line.
Image The new figure you get after a transformation.
Isometry A transformation that keeps every distance the same, such as a rotation or a translation.
Mirror A reflection flips a figure across a line as if that line were one of these.
Reduce To make a figure smaller while keeping its shape.
Reflection A flip across a line that stays fixed, giving a mirror picture of the figure.
Rigid Keeping shape and size. Slides, flips and turns are motions of this kind.
Rotation A turn of a figure around a fixed center by some angle.
Slide To move a figure along without turning it or flipping it.
Symmetry A figure has it when one half matches the other across a line, or it fits itself after a turn.
Tessellation A covering of a flat surface with shapes that leave no gaps and no overlaps.
Tiling A tessellation. Squares, equilateral triangles and regular hexagons can each make one alone.
Transformation A rule that moves or resizes a figure: a slide, a flip, a turn or a change of size.
Translation A move that shifts every point of a figure the same distance in the same direction.
Turn To spin a figure around a point.
Vector A quantity with a size and a direction, drawn as an arrow. It can describe a translation.

Measuring and Coordinates 20

Area The amount of surface inside a flat shape, measured in square units.
Axis A number line used to locate points on a grid. The x one runs across and the y one runs up.
Collinear Lying on the same straight line.
Coordinate One of the numbers, such as the x or the y, that tell where a point is on a grid.
Dimension A direction you can measure in. A line has 1, a square has 2 and a cube has 3.
Distance How far apart two points are.
Endpoint Either of the two points that mark the ends of a segment.
Equidistant The same distance away. Every point on a circle is this from the center.
Formula A rule written with symbols, such as A = l × w for the area of a rectangle.
Grid Evenly spaced lines that cross to form squares, used for locating points.
Height How tall a figure is, measured straight up from its base.
Horizontal Level, like the horizon: running straight across from left to right.
Length How long something is from end to end.
Midpoint The point that divides a segment into two parts of the same length.
Origin The point (0, 0), where the x and y axes cross.
Perimeter The distance around the outside of a flat shape.
Slope The steepness of a line: how far it rises for each step across.
Straightedge A stiff bar with a straight side and no marks, used with a compass in constructions.
Unit A fixed amount used for measuring, such as an inch, a centimeter or a degree.
Width How wide something is from side to side.

Reasoning and Proof 22

Axiom Another word for a postulate: a starting truth that is accepted without proof.
Conclusion The then part of an if-then statement: what the proof has to reach.
Conjecture A statement you think is true from the patterns you see, but have not proved.
Construct To draw a figure exactly, using only a compass and a straightedge.
Converse The statement made by swapping the if part and the then part.
Corollary A result that follows from a theorem with little or no extra proof.
Counterexample One example that shows a statement is false.
Deductive Reasoning from accepted facts and rules to a result that must follow.
Definition A statement of exactly what a word means. Proofs lean on these.
Euclid Greek mathematician of about 300 BC whose 13-book Elements builds geometry from 5 postulates.
Geometry The math of points, lines, angles, surfaces and solids.
Given The information a proof starts with: what you are told is true.
Hypothesis The if part of an if-then statement: what you are told to assume.
Inductive Reasoning from examples and patterns to a general rule.
Inverse The statement made by negating both the if part and the then part.
Justify To give the reason a step in a proof is allowed.
Lemma A small helping result proved on the way to a bigger theorem.
Postulate A statement accepted as true without proof and used as a starting point.
Proof A chain of statements, each backed by a reason, that shows a claim must be true.
Prove To show by logical steps that a statement must be true.
Statement A sentence that is either true or false.
Theorem A statement that has been proved from definitions, postulates and earlier results.

How this list was compiled: 167 geometry words chosen and defined for this site, in eight themed lists plus a key terms list, an easy list of words of 3 to 5 letters and a hard list of words of 9 letters or more. Spellings and most meanings were checked in the American Heritage Dictionary, https://www.ahdictionary.com/, on 2026-09-19; Incenter and Circumcenter are not entered there and follow https://en.wikipedia.org/wiki/Triangle. Other facts in the clues were checked the same day in the English Wikipedia article on each term. Trapezoid has the American meaning, a quadrilateral with a pair of parallel sides. A word is left out where a list-mate would read inside it in the grid, such as Semicircle beside Circle. Clues are our own wording. Licence: own work

How it works

Print, then Save as PDF in the print dialog, turns the puzzle above into a geometry word search PDF. It hides 16 of 24 key terms like Vertex and Perimeter. Ten more lists run from lines and angles to proof.

Read the full guide

Match the list to the chapter

Under the puzzle, Start from a list has eight themed lists: Lines and Angles, Triangles, Polygons and Quadrilaterals, Circles, Solid Figures, Transformations and Symmetry, Measuring and Coordinates, and Reasoning and Proof. For a shapes word search, print Polygons and Quadrilaterals, then Solid Figures. Easy Geometry adds 40 words of 3 to 5 letters, such as Cube and Ray, and Hard Geometry 49 words of 9 letters or more. After Lines and Angles, print the angle relationships worksheet.

A geometry vocabulary word search puzzle can test meanings: tick Show clues, not words.
Keep Geometry Key Terms at 13 by 13 or larger: Perpendicular needs 13 squares. Cross section is hidden as CROSSSECTION.
Grades 3 and 4: Easy Geometry, 10 by 10 and Large print, both under More options. High school: Hard Geometry, Hard level, 20 by 20.

Questions and answers

Why is Angle missing from the Triangles list?

ANGLE reads inside TRIANGLE and RECTANGLE, so a grid holding both would show it twice while the key marks one. Angle sits in Lines and Angles, away from both. Semicircle, Hemisphere and Dodecagon are left out altogether, because Circle, Sphere and Decagon read inside them.

Where do the definitions come from?

They were written for this page and checked in September 2026 against the American Heritage Dictionary or Wikipedia. Counts are in the clues: a cube has 6 faces, 12 edges and 11 different nets. Trapezoid has its American meaning: a pair of parallel sides.

Can I add terms from my own textbook?

Yes. Type them at the end of the word list under the grid, one at a time, or paste them with commas between them. A term longer than the grid is wide is left out, so widen the grid first.

All 167 words

Lines and Angles 24

Lines and Angles, continued

Triangles 21

Polygons and Quadrilaterals 21

Circles 19

Solid Figures 21

Transformations and Symmetry 19

Measuring and Coordinates 20

Reasoning and Proof 22

How it works

Match the list to the chapter

Questions and answers

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