Interior and Exterior Angles of Triangles

Front

The Triangle Sum Theorem states that the sum of all angles in a triangle is ______.

Back

180°

Front

What kind of triangle has one angle greater than 90 degrees?

Back

Obtuse

Front

An angle whose measure is exactly 90 degrees is called a ______ angle.

Back

right

Front

If one angle in a triangle measures 40° and another measures 50°, what is the measure of the third angle?

Back

90°

Front

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

Back

x = 90°

Front

What is the measure of an acute angle?

Back

Less than 90°

Front

What is the measure of a straight angle?

Back

180°

Front

In a right triangle, what is the relationship between the angles?

Back

One angle is 90°, and the sum of the other two angles is 90°.

Front

If a triangle has angles measuring 30°, 60°, and 90°, what type of triangle is it?

Back

Right triangle

Front

What is the exterior angle theorem?

Back

The exterior angle of a triangle is equal to the sum of the two opposite interior angles.