Finding Missing Angles

Front

What are complementary angles?

Back

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

Front

What are supplementary angles?

Back

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

Front

What are vertical angles?

Back

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

Front

What is an angle bisector?

Back

An angle bisector is a line or ray that divides an angle into two equal parts.

Front

If m∠1 = 30°, what is m∠3 if they are vertical angles?

Back

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

Front

If two angles are complementary and one angle is 28°, what is the other angle?

Back

The other angle is 62° (90° - 28° = 62°).

Front

If two angles are supplementary and one angle is 142°, what is the other angle?

Back

The other angle is 38° (180° - 142° = 38°).

Front

If m∠BPD + m∠DPC = 72°, what is m∠APC if m∠BPD = 18°?

Back

m∠APC = 108° (72° - 18° = 54°).

Front

What is the sum of angles in a triangle?

Back

The sum of angles in a triangle is always 180 degrees.

Front

What is the measure of each angle in a right triangle?

Back

In a right triangle, one angle measures 90°, and the other two angles are complementary.