Angle Vocabulary Worksheet

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NameDateMade at homeroomtools.comDraw a line from each one on the left to its partner on the right.Angle vocabularyanglevertexraysidedegreeprotractoracute angleright angleobtuse anglestraight anglereflex anglefull angleeither of the two rays that makeup an anglean angle of more than 0 butunder 90 degreesa unit of angle measure, 1/360 ofa full turnthe angle found at each corner ofa squarean angle of 180 degrees: half of afull turnan angle bigger than a straightangle, short of a full turnwhat two rays form when theystart from one pointthe corner point of an anglean angle of 360 degrees, onecomplete turnan angle between a right angleand a straight angle in sizea half-line: it has one endpointand no end the other waya marked half circle used tomeasure angles
NameDateMade at homeroomtools.comDraw a line from each one on the left to its partner on the right.Angle vocabularyAnswer keyanglevertexraysidedegreeprotractoracute angleright angleobtuse anglestraight anglereflex anglefull angleeither of the two rays that makeup an anglean angle of more than 0 butunder 90 degreesa unit of angle measure, 1/360 ofa full turnthe angle found at each corner ofa squarean angle of 180 degrees: half of afull turnan angle bigger than a straightangle, short of a full turnwhat two rays form when theystart from one pointthe corner point of an anglean angle of 360 degrees, onecomplete turnan angle between a right angleand a straight angle in sizea half-line: it has one endpointand no end the other waya marked half circle used tomeasure angles
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All 36 terms

Kinds of angle 12

  • acute angle An angle of more than 0 but under 90 degrees. An angle of 45 degrees is acute.
  • angle What two rays form when they start from one point. The hands of a clock form an angle.
  • degree A unit of angle measure, 1/360 of a full turn. A right angle measures 90 degrees.
  • full angle An angle of 360 degrees, one complete turn. A full angle brings a ray back to where it started.
  • obtuse angle An angle between a right angle and a straight angle in size. An angle of 120 degrees is obtuse.
  • protractor A marked half circle used to measure angles. A half-circle protractor has marks from 0 up to 180.
  • ray A half-line: it has one endpoint and no end the other way. Ray AB starts at A and runs on through B without end.
  • reflex angle An angle bigger than a straight angle, short of a full turn. An angle of 270 degrees is a reflex angle.
  • right angle The angle found at each corner of a square. The letter L is drawn with a right angle.
  • side Either of the two rays that make up an angle. The sides of an angle meet at its vertex.
  • straight angle An angle of 180 degrees: half of a full turn. A straight angle looks like a straight line.
  • vertex The corner point of an angle. In angle ABC the vertex is B.
Show all 36 terms (24 more)

Pairs of angles 12

  • adjacent angles Neighboring angles with one vertex and one arm in common. Two slices of pizza cut side by side show adjacent angles.
  • angle bisector The ray from the vertex that halves an angle. The bisector of a 90 degree angle makes two angles of 45 degrees.
  • central angle An angle whose vertex is the center point of a circle. A quarter of a pie has a central angle of 90 degrees.
  • complementary angles A pair of angles whose sizes total 90 degrees. 30 degrees and 60 degrees are complementary.
  • congruent Matching exactly when one is laid on the other. Two angles of 50 degrees are congruent.
  • conjugate angles A pair of angles whose sizes total 360 degrees. 100 degrees and 260 degrees are conjugate angles.
  • dihedral angle The angle at which two flat surfaces (planes) meet. Two walls meet at a dihedral angle.
  • exterior angle An angle between a polygon's side and the next side extended. Each exterior angle of a square is 90 degrees.
  • interior angle An angle on the inside of a polygon, at one of its corners. Each interior angle of a square is 90 degrees.
  • linear pair The two angles formed where a ray meets a straight line. The two angles of a linear pair add up to 180 degrees.
  • supplementary angles A pair of angles whose sizes total 180 degrees. 110 degrees and 70 degrees are supplementary.
  • vertical angles The opposite angles formed where two lines cross. Vertical angles are equal in measure.

Lines and a transversal 12

  • alternate exterior angles An outer pair, on opposite sides of the transversal. If the lines are parallel, alternate exterior angles are equal.
  • alternate interior angles An inner pair, on opposite sides of the transversal. If the lines are parallel, alternate interior angles are equal.
  • collinear Placed along a single line. Any two points are collinear.
  • concurrent Passing through one common point. The three medians of a triangle are concurrent.
  • consecutive interior angles An inner pair, both on the same side of the transversal. If the lines are parallel, they add up to 180 degrees.
  • coplanar Contained in one plane. Lines drawn on one sheet of paper are coplanar.
  • corresponding angles Angles in matching corners at the two crossings. If the lines are parallel, corresponding angles are equal.
  • intersect To cross or meet at a point. The two strokes of the letter X intersect.
  • parallel lines Lines in one plane that have no point in common. The lines on ruled notebook paper are parallel lines.
  • perpendicular Forming a 90 degree angle where they cross. On graph paper the lines across are perpendicular to the lines down.
  • skew lines Lines not in one plane: not parallel, yet never crossing. A line along the floor and a line across the ceiling can be skew lines.
  • transversal A line that cuts across a pair of other lines. A road that cuts across two streets acts as a transversal.

How this list was compiled: Term list chosen for this site on 2026-10-02. Each meaning is written in our own words and was checked that day against the entry for the term in Wiktionary, the free dictionary (https://en.wiktionary.org/), whose text is under the Creative Commons Attribution-ShareAlike license, and, for the terms with no entry of their own (parallel lines, alternate interior angles, alternate exterior angles, consecutive interior angles, skew lines, central angle), against the articles Angle, Transversal (geometry), Skew lines and Central angle in English Wikipedia (https://en.wikipedia.org/), whose text is under the Creative Commons Attribution-ShareAlike license. The measures in the examples are our own working. The example after each meaning is our own. Licence: own work

How it works

This angle vocabulary worksheet prints twelve terms down the left and their meanings, mixed up, down the right. Three sets cover the kinds of angle, pairs of angles, and parallel lines cut by a transversal.

Read the full guide

A lines and angles vocabulary worksheet in three sets

Set opens on Kinds of angle: vertex, ray, degree, protractor, and acute, right, obtuse, straight and reflex angle. Pairs of angles has adjacent, vertical, complementary and supplementary angles and linear pair.

Parallel lines cut by a transversal vocabulary worksheet

The third set prints transversal, parallel lines, corresponding angles, and alternate interior, alternate exterior and consecutive interior angles, with perpendicular, skew lines, coplanar and collinear. Under the tool each term has an example.

  • The sheet prints words and meanings, with no drawing of the angles.

Questions and answers

What are the types of angles?

By size: an acute angle is less than 90 degrees, a right angle is exactly 90, an obtuse angle is between 90 and 180, a straight angle is 180, a reflex angle is between 180 and 360, and a full angle is 360.

What is the difference between complementary and supplementary angles?

Complementary angles add up to 90 degrees, such as 30 and 60. Supplementary angles add up to 180 degrees, such as 110 and 70. A linear pair is two supplementary angles side by side on a line.

What angles are formed when a transversal cuts parallel lines?

Corresponding angles, alternate interior angles and alternate exterior angles, which are equal in each pair, and consecutive interior angles, which add up to 180 degrees.

Is an answer key included?

Yes. A second page repeats the sheet and draws a line from each term to the meaning that fits it. Under More options a check box takes the key off.

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