10.04 Name and classify angles

Ideas

Being able to compare angles can help us in this lesson. Let's try this problem to review.

Which of these angles is larger?

Worked Solution

Create a strategy

Choose the option with a larger turn between the lines.

Apply the idea

The answer is option B.

Idea summary

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

This video looks at right angles as quarter turns measuring 90\degree.

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Which of the following is a right angle?

Worked Solution

Create a strategy

Look for the angle with a small square in the corner.

Apply the idea

Option A has a small square at the corner, so the answer is option A.

Idea summary

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