Solving for a Missing Angle

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

If one angle in a triangle is 90 degrees, what type of triangle is it?

Back

It is a right triangle.

Front

What is the formula to find the missing angle in a triangle?

Back

To find the missing angle, subtract the sum of the known angles from 180 degrees.

Front

If two angles in a triangle are equal, what type of triangle is it?

Back

It is an isosceles triangle.

Front

What is the measure of the third angle if two angles are 30 degrees and 70 degrees?

Back

The third angle measures 80 degrees.

Front

What is the relationship between the angles in complementary angles?

Back

Complementary angles add up to 90 degrees.

Front

What is the relationship between the angles in supplementary angles?

Back

Supplementary angles add up to 180 degrees.

Front

If angle A is 30 degrees, what is the measure of its complement?

Back

The complement of angle A is 60 degrees.

Front

If angle B is 110 degrees, what is the measure of its supplement?

Back

The supplement of angle B is 70 degrees.

Front

What is an exterior angle of a triangle?

Back

An exterior angle is equal to the sum of the two opposite interior angles.