Exterior and Interior Angles of Triangles

1. Make sure the “Show Interior Angles” box is selected.

2. Drag the “slide me!” point to the right.

What figure/shape did the three interior angles of a triangle make?

Based on your previous answer, what must the sum of the 3 interior angles of a triangle be?

Find the measure of angle B.

1. Now make sure the “Show Exterior Angles” box is selected.

2. Drag the “slide me!” point to the right.

What figure/shape did the three exterior angles of a triangle make?

Based on your previous answer, what must the sum of the 3 exterior angles of a triangle be?

Find the measure of x.

In the search bar, type in:

kala remote interior angles

Open the simulation/exploration.

What is the relationship between the remote interior angles and the exterior angle?

What is the measure of angle PRS?