Geometry Foundations Vocab

part of a line consisting of two endpoints and all points between them

• line

• ray

• line segment

• midpoint

an angle that measures 180°

• Acute angle

• Obtuse angle

• Right angle

• Straight angle

Two angles whose measures have a sum of 180°

• Complementary angles

• Supplementary angles

• Vertical angles

• Adjacent angles

The common endpoint of the sides of the angle

• midpoint

• endpoint

• vertex

• ray

Two angles whose sides form two pairs of opposite rays.

• Linear pair

• Vertical angles

• Supplementary angles

• Complementary angles

What is the term for a part of a line with two endpoints?

• point

• ray

• angle

• line segment

 This is what kind of angle?

• acute

• obtuse

• right

• straight

Which are pairs of adjacent angles? Choose all that apply.

• ∠COB & ∠COA

• ∠AOD & ∠AOC

• ∠BOD & ∠AOD

• ∠BOD & ∠AOC

What is a straight angle? Choose all that apply.

• Is also known as a linear pair.

• Looks like a line.

• An angle that measures exactly 90 degrees.

• An angle that measures exactly 180 degrees.

What is the difference between a LINE SEGMENT and a LINE?

• Line Segments are two-dimensional, Lines are one-dimensional

• Lines can be represented on single planes; Line Segments can only be represented on multiple planes.

• Line Segments have finite lengths; Lines go on forever.

• Line segments are geometric figures; Lines are not.