# Lesson 13 Find Angle Measurements

Let’s compose and decompose angles to find their measurements.

## Warm-up Notice and Wonder: Corner Pieces

What do you notice? What do you wonder?

## Activity 1 How Big Are These Angles?

## Problem 1

Your teacher will give you materials that can help you find angle measurements.

Use the materials and what you know about a right angle to find the size of angles

## Problem 2

Next, use the measurements of angles

## Activity 2 Angles in a Kite

Your teacher will give you a square sheet of paper. Follow the steps to fold the paper into a kite. Fold as precisely as possible.

## Practice Problems

## Problem 1

The circle is divided into 12 equal parts. What is the measure of angle

? Explain or show how you know.

Can you put together

angles to make a circle? How many of them will it take?

## Problem 2

A circle has been cut into eighths. How many degrees is the angle labeled

? Explain or show your reasoning. Another circle has been cut into fifths. How many degrees is the angle labeled

? Explain or show your reasoning.

## Problem 3

What is the measure of each angle

? Explain or show how you know. How many

angles can you fit together at one vertex without gaps or overlaps?