Geometry Crossword Puzzle, Shapes to Proofs

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Geometry Crossword

Read each clue and write the answer in the squares that start at its number, one letter in each square.

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Tap a square, and its clue shows here.

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Word bank

  • Cylinder
  • Dodecagon
  • Edges
  • Kite
  • Net
  • Parallelogram
  • Pentagon
  • Polyhedron
  • Pyramid
  • Sphere
  • Tetrahedron
  • Trapezoid

Type in a square and the next one takes over. Tap the same square again, or press Space, to switch between Across and Down. Arrow keys move around the grid, Enter goes to the next clue, and a clue takes you to its squares.

Print gives 3 pages on Letter or A4: the grid, the clues on a sheet of their own, then the answer key. The squares print 10 mm wide. For a PDF, choose Save as PDF in the print window.

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Answer key: Geometry Crossword

1E2P3DODECAGONGR4C5KITEAYSLLLI6TETRAHEDRONLD7TRAPEZOIDE8SGR9POLYHEDRONHA10NET11PYRAMIDR12PENTAGON

Across 3 DODECAGON · 5 KITE · 6 TETRAHEDRON · 7 TRAPEZOID · 9 POLYHEDRON · 10 NET · 11 PYRAMID · 12 PENTAGON

Down 1 EDGES · 2 PARALLELOGRAM · 4 CYLINDER · 8 SPHERE

Next step Find geometry words in a word searchTry the math crossword

All 60 clues

Show all clues and answers

Shapes and Solids 20

  • Cylinder Solid shaped like a can
  • Dodecagon Polygon with twelve sides
  • Edges Lines where two faces of a solid meet
  • Heptagon Polygon with seven sides
  • Hexagon Six-sided shape of a honeycomb cell
  • Kite Four-sided shape with two pairs of equal sides next to each other
  • Net Flat pattern that folds up into a solid
  • Octahedron Solid with eight triangular faces
  • Parallelogram Four-sided shape whose opposite sides are parallel and equal
  • Pentagon Five-sided polygon
  • Polyhedron Solid whose faces are all flat polygons
  • Prism Solid with two matching ends joined by rectangles
  • Pyramid Solid with a polygon base and triangular sides meeting at the top
  • Quadrilateral Any polygon with four sides
  • Regular Said of a polygon whose sides are all equal and angles are all equal
  • Rhombus Four-sided shape with all sides equal, like a tilted square
  • Sphere Perfectly round solid, like a ball
  • Tetrahedron Solid with four triangular faces
  • Trapezoid Four-sided shape with a pair of parallel sides, by its North American name
  • Vertices Corners of a polygon or a solid

Lines and Angles 20

  • Acute Of an angle, less than 90 degrees
  • Adjacent Of two angles, sharing a vertex and a side
  • Bisect Cut into two equal parts
  • Collinear Lying on one line
  • Complementary Of two angles, adding up to 90 degrees
  • Corresponding Of angles, in matching positions where one line crosses two others
  • Endpoint Point that marks where a piece of a line stops
  • Midpoint Point exactly halfway between two ends
  • Obtuse Of an angle, more than 90 degrees but less than 180
  • Perpendicular Meeting at 90 degrees
  • Plane Flat surface that goes on forever in every direction
  • Protractor Half-circle tool for measuring angles
  • Ray Part of a line that starts at a point and goes on forever one way
  • Reflex Of an angle, more than 180 degrees but less than 360
  • Right Of an angle, exactly 90 degrees
  • Segment Part of a line with a start and an end
  • Skew Of two lines in space, not parallel and never meeting
  • Straight Of an angle, exactly 180 degrees
  • Supplementary Of two angles, adding up to 180 degrees
  • Transversal Line that crosses two or more other lines

Circles, Moves and Proof 20

  • Arc Curved piece of a circle
  • Chord Line piece with both ends on a circle
  • Circumference Distance around a circle
  • Congruent Same shape and same size
  • Converse The if-then statement you get by swapping the if and the then
  • Diameter Distance across a circle through its center
  • Dilation Transformation that enlarges or shrinks a figure
  • Euclid Greek mathematician of about 300 BC whose Elements laid out geometry
  • Hypotenuse Side opposite the 90-degree angle of a triangle
  • Postulate Basic statement taken as true and never proved
  • Proof Step-by-step argument that shows a statement is true
  • Radius Distance from the center of a circle to its edge
  • Rotation Transformation that turns a figure about a point
  • Secant Line that cuts through a circle at two points
  • Sector Pie-slice part of a circle
  • Similar Same shape but not always the same size
  • Sine Trig ratio: the side opposite an angle over the side opposite the 90-degree angle
  • Tangent Line that touches a circle at exactly one point
  • Theorem Statement that has been proved
  • Translation Transformation that slides a figure without turning it

How this list was compiled: 60 geometry clues written for this site in three sets: shapes and solids for grades 3 to 5, lines and angles for middle school, and circles, transformations and proof for high school. Definitions were checked against English Wikipedia (en.wikipedia.org) in September 2026. Trapezoid is the North American name; British books say trapezium. No clue was copied from a published puzzle. Licence: own work

How it works

This geometry crossword puzzle runs from grade 3 to high school in three sets. Each clue is a definition to match, so it works as vocabulary review before a unit test.

Read the full guide

Three levels

Shapes and Solids has Rhombus, Net and Octahedron for grades 3 to 5. Lines and Angles has Reflex, Skew and Supplementary for middle school. Circles, Moves and Proof has Secant, Dilation, Postulate and Converse for high school.

Print or solve

The page opens with the word bank under the clues; untick it in More options for a harder sheet. Print gives Letter or A4 with the answer key last.

  • For a mixed class, print Shapes and Solids with the word bank on and Lines and Angles without it.

Questions and answers

Which trapezoid definition do the clues use?

The clue calls it a four-sided shape with a pair of parallel sides and names it the North American word. Some books require exactly one pair, others at least one; British books call the shape a trapezium.

Is this geometry crossword different from the math crossword?

Yes. The math crossword covers all of math, with a few shapes. This one is geometry only, down to reflex angles, secants and the converse of a statement.

Is there an answer key?

Yes. Every print ends with the answer key on a sheet of its own, and Show all clues and answers, under the puzzle, lists all 60 clues with their answers.

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