Understanding Angle Relationships

Front

Complementary angles

Back

Front

Supplementary angles

Back

Front

Vertical angles

Back

angles formed by two intersecting lines; always equal

Front

Adjacent angles

Back

that share a common side and vertex, but do not overlap

Front

Linear pair

Back

Front

Corresponding angles (parallel lines)

Back

in matching corners when a transversal crosses parallel lines; always equal

Front

Alternate interior angles

Back

on opposite sides of a transversal, inside parallel lines; always equal

Front

Alternate exterior angles

Back

on opposite sides of a transversal, outside parallel lines; always equal

Front

Back

latex="x = 55^\circ"> (complementary angles)

Front

Back

latex="x = 36^\circ"> (supplementary angles)