Lesson Worksheet: Interior and Exterior Angles of Triangles Mathematics

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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 .

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