Angle Sum and Exterior Angle Theorem

Front

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

Back

180 degrees.

Front

If two angles of a triangle are 30 degrees and 70 degrees, what is the measure of the third angle?

Back

80 degrees.

Front

What is the measure of the missing angle if the known angle is 130 degrees?

Back

50 degrees.

Front

What does the Exterior Angle Theorem state?

Back

The exterior angle is equal to the sum of the two remote interior angles.

Front

What are remote interior angles of a triangle?

Back

Angles inside a triangle that are not adjacent to the exterior angle.

Front

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

Back

It is a right triangle.

Front

What is the relationship between the exterior angle and the interior angles of a triangle?

Back

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

Front

How do you calculate the measure of an unknown angle in a triangle?

Back

Subtract the sum of the known angles from 180 degrees.

Front

What is the measure of an angle if the other two angles are 40 degrees and 60 degrees?

Back

80 degrees.

Front

If the angles of a triangle are in the ratio 2:3:4, what are the measures of the angles?

Back

40 degrees, 60 degrees, and 80 degrees.