Triangle Sum Theorem

Front

Angles that are exactly 90 degrees are called _____ ______.

Back

right angles

Front

What is the missing angle if two angles measure 30° and 60°?

Back

90 degrees

Front

Find x if the angles in a triangle are 30°, x, and 60°.

Back

x = 90 degrees

Front

A triangle has one angle that measures 45° and one that measures 60°. What is the measure of the third angle?

Back

75°

Front

Find x if the angles in a triangle are 45°, 45°, and x.

Back

x = 90 degrees

Front

The sum of the angles in a triangle is always equal to _____ degrees.

Back

180 degrees

Front

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

Back

Right triangle

Front

In a triangle, if one angle measures 120°, what can you say about the other two angles?

Back

They must each be less than 60°.

Front

What is the measure of the third angle in a triangle if the other two angles are 70° and 40°?

Back

70°

Front

If two angles of a triangle are equal and one measures 50°, what is the measure of the third angle?

Back

80°