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?