ANGLE PAIRS

Vertical angles are the angles opposite each other when two lines intersect. They are always equal in measure.

Complementary angles are two angles whose measures add up to 90 degrees.

Supplementary angles are two angles whose measures add up to 180 degrees.

Adjacent angles are two angles that share a common side and a common vertex but do not overlap.

An angle can be named using three letters, with the middle letter representing the vertex of the angle. For example,

m∠B = 74° (because vertical angles are equal).

m∠3 = 30° (because vertical angles are equal).

They are supplementary angles.

The measure is 30° (because 90° - 60° = 30°).

The measure is 30° (because 180° - 150° = 30°).