Triangle Angle-sum and Exterior Angle Theorem Review

Front

True or False: Every triangle that can be drawn on a flat surface has angles that add up to exactly 180 degrees.

Back

True

Front

What is the sum of the interior angles of a triangle?

Back

180 degrees

Front

Angles that are exactly 90 degrees are called _____ ______.

Back

right angles

Front

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

Back

70°

Front

What is the measure of angle b if angle a is 144° and they are supplementary?

Back

36°

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.

Front

If one angle of a triangle is 50° and another is 60°, what is the third angle?

Back

70°

Front

What type of triangle has all angles less than 90 degrees?

Back

acute triangle

Front

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

Back

obtuse triangle

Front

What is the relationship between the angles in a right triangle?

Back

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