# Lesson Worksheet: Interior and Exterior Angles of Triangles Mathematics

In this worksheet, we will practice completing geometric proofs using the angle sum of a triangle and finding interior and exterior angles of triangles.

Q1:

In a triangle , if , what type of angle is the exterior angle at vertex ?

• Aright
• Breflex
• Cacute
• Dobtuse

Q2:

The figure shows the exterior angles of a given triangle. Find the sum of the exterior angles. Q3:

What is the sum of the measures of the exterior angles of a triangle?

Q4:

Find . Q5:

In a triangle , if , what type of angle is the interior angle at vertex ?

• AReflex
• BObtuse
• CAcute
• DRight

Q6:

In the following triangle , if and , find . Q7:

In the given figure, if , , and , find the measure of . Q8:

In the given figure, find the measure of the interior angle . Q9:

In the given figure, find the measure of the exterior angle . Q10:

Find the measure of . This lesson includes 2 additional questions and 63 additional question variations for subscribers.