Front

Common endpoint of 2 rays

Back

Vertex

Front

Line segments of equal length.

Back

Congruent

Front

Divide into congruent segments or angles

Back

Bisector

Front

Two angles that sum to 90.

Back

Complementary

Front

Two angles with a sum of 180°

Back

Supplementary

Front

Two angles sharing a vertex and side, with no common interior points.

Back

Adjacent Angles

Front

Two adjacent angles with noncommon sides as opposite rays.

Back

Linear Pair

Front

Two angles with sides as opposite rays.

Back

Vertical Angles

Front

∠AOB and ∠COB are best described as -

Back

adjacent angles

Front

m∠1 = 30°; m∠3 = ?

Back

30°