Finding missing angles

Front

What is the sum of the angles in a triangle?

Back

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

Front

Define complementary angles.

Back

Complementary angles are two angles that add up to 90°.

Front

What are supplementary angles?

Back

Supplementary angles are two angles that add up to 180°.

Front

If one angle measures 45°, what is the measure of its complementary angle?

Back

The complementary angle measures 45°.

Front

If two angles are supplementary and one measures 70°, what is the measure of the other angle?

Back

The other angle measures 110°.

Front

What is the value of x if the equation is x + 25 = 90?

Back

x = 65.

Front

How do you find the missing angle in a triangle if two angles are known?

Back

Subtract the sum of the known angles from 180°.

Front

What is the relationship between angles formed by intersecting lines?

Back

Vertical angles are equal, and adjacent angles are supplementary.

Front

If angle A is 60° and angle B is 120°, are they complementary or supplementary?

Back

They are supplementary because they add up to 180°.

Front

What is the measure of angle x if angle x and angle y are complementary and angle y is 30°?

Back

Angle x measures 60°.