ANGLE PAIRS

Front

What are vertical angles?

Back

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

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 adjacent angles?

Back

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

Front

How do you name an angle using three letters?

Back

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

Front

If m∠A = 74°, what is m∠B if ∠A and ∠B are vertical angles?

Back

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

Front

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

Back

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

Front

If m∠4 + m∠1 = 180°, what type of angle pair are ∠4 and ∠1?

Back

They are supplementary angles.

Front

What is the measure of an angle that is complementary to a 60° angle?

Back

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

Front

What is the measure of an angle that is supplementary to a 150° angle?

Back

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