Angle Relationships

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 congruent (equal in measure).

Front

If two angles are complementary and one angle measures 30 degrees, what is the measure of the other angle?

Back

60 degrees (90 - 30 = 60).

Front

If two angles are supplementary and one angle measures 110 degrees, what is the measure of the other angle?

Back

70 degrees (180 - 110 = 70).

Front

What is the sum of the angles in a triangle?

Back

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

Front

What is the value of x if angle A is 45 degrees and angle B is complementary to angle A?

Back

x = 45 degrees (90 - 45 = 45).

Front

What is the relationship between adjacent angles?

Back

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

Front

If angle C is 90 degrees, what type of angle is angle D if it is complementary to angle C?

Back

Angle D is also 90 degrees.

Front

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

Back

One angle is 90 degrees, and the other two angles are acute, adding up to 90 degrees.