Angles of Triangles

Classify the triangle by its sides and its angles.

Classify the triangle by its sides and its angles.

Classify the triangle by its sides and its angles.

Classify the triangle by its sides and its angles. Use measurement tools to check your answer.

What is the measurement of the remaining angle?

What is the measurement of the exterior angle x?

The measure of the exterior angle of the triangle is,,,?

Find the measure of the numbered angles.

You and three of your friends are building a ramp for a community service project. The ramp has support struts set up as shown in the diagram. Regulations say that the ramp (the black line at the bottom) must be parallel to the top strut of the support. You and your friends have each measured an angle. One of your friends thinks for a minute and says that the strut is definitely parallel and you are ready for the inspector to check your work. Is your friend right? Prove your answer using the diagram and theorems we've covered so far this year.