Triangle Sum Theorem and Exterior Angle Theorem

Front

Angles that are exactly 90 degrees are called _____ ______.

Back

right angles

Front

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

Back

180°

Front

What is the measure of the third angle if two angles in a triangle measure 40° and 60°?

Back

80°

Front

If one angle of a triangle is 50° and another is 70°, what is the measure of the third angle?

Back

60°

Front

The Exterior Angle Theorem states that the measure of an exterior angle is equal to the sum of the measures of the two ______ angles.

Back

remote interior

Front

In a triangle, if one angle measures 30°, what is the maximum possible measure of the other two angles?

Back

150°

Front

If angle A is 45° and angle B is 45°, what is angle C in triangle ABC?

Back

90°

Front

What is the relationship between the angles of a triangle and a straight line?

Back

The angles of a triangle sum to 180°, and a straight line measures 180°.

Front

If angle D is an exterior angle of triangle EFG, and angles E and F measure 40° and 60° respectively, what is the measure of angle D?

Back

100°

Front

In triangle XYZ, if angle X is 70° and angle Y is 50°, what is angle Z?

Back

60°