Geometry Vocabulary

Front

Collinear points are 3 points that lie on the same __________

Back

line

Front

Coplanar points are 3 points that lie on the same __________ but not on the same line.

Back

plane

Front

Lines: 0 endpoints, Line segments: 2, Rays: 1

Back

Lines: 0, Line segments: 2, Rays: 1

Front

Coplanar lines that never intersect are called ______ lines.

Back

Parallel

Front

Coplanar lines that intersect at right angles are called ______ lines.

Back

Perpendicular

Front

An angle is defined as two rays that share the same _____

Back

vertex

Front

Acute angles are angles that are...

Back

less than 90°

Front

Angles are defined by their measurement. Obtuse angles are ____

Back

between 90° and 180°

Front

Right angles are ____

Back

equal to 90°

Front

Angles sharing a side and vertex are called _____

Back

adjacent angles