Geometry Vocab

Question 1

Acute angle

Answer 1

an angle that measures less than 90°

Question 2

Obtuse angle

Answer 2

an angle that measure greater than 90°, but less than 180°

Question 3

Complementary angle

Answer 3

two angles whose measure have a sum of 90°

Question 4

Right angle

Answer 4

an angle that measures 90°

Question 5

Supplementary angle

Answer 5

two angles whose measures have a sum of 180°

Question 6

Straight angle

Answer 6

an angle that measures 180°

Question 7

Alternate interior angles

Answer 7

two angles inside the parallel lines that are on opposite sides of the transversal

Question 8

Vertical angles

Answer 8

two nonadjacent angles formed when two lines intersect. The angles in a vertical angle pair are congruent.

Question 9

Line

Answer 9

a straight path that continues infinitely in both directions

Question 10

Line segment

Answer 10

a line with definite endpoints

Question 11

Ray

Answer 11

a part of a line starting at a particular point and extending infinitely in one direction

Question 12

Parallel lines

Answer 12

lines in the same plane that do not intersect

Question 13

Perpendicular lines

Answer 13

lines that intersect to form a 90° angle

Question 14

Transversal

Answer 14

is a line that intersects two or more other lines at different points

Question 15

Corresponding angle

Answer 15

a pair of angles that have the same relative position at each intersection where the transversal crosses the other two

Question 16

Adjacent angles

Answer 16

angles that have a common side but no interior points in common

Question 17

Alternate exterior angles

Answer 17

two angles outside of the parallel lines that are on opposite sides of the transversal

Question 18

Congruent angle

Answer 18

an angle that has the same measure as another angle

Question 19

Intersecting lines

Answer 19

lines that cross at one point

Question 20

Vertex

Answer 20

is the common endpoint of the rays forming the angle