Lesson

Let's review how to identify angles.

Which of the following is a right angle?

A

B

Worked Solution

Idea summary

A right angle is exactly 90\degree. It can also be called a quarter turn.

Let's see how we can compare two angles of a skateboard ramp.

Which angle is smaller?

A

B

Worked Solution

Idea summary

Angles can be compared by how large the turn is between the lines.

We can measure the exact angle, using a special tool called a protractor. Let's see how to use one.

What is the angle being measured by this protractor?

Worked Solution

Idea summary

A protractor is an instrument that allows us to measure an angle. Start with one arm of the angle on the 0\degree line and read the amount of turn required to reach the second arm.

measures and constructs angles, and applies angle relationships to find unknown angles