# 5. Using circles to find angle measurements (FP)

teaches Common Core State Standards CCSS.Math.Content.4.G.A.1 http://corestandards.org/Math/Content/4/G/A/1
teaches Common Core State Standards CCSS.Math.Content.4.MD.C.5a http://corestandards.org/Math/Content/4/MD/C/5/a
teaches Common Core State Standards CCSS.Math.Practice.MP4 http://corestandards.org/Math/Practice/MP4

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Lesson objective: Practice visualizing angle rotation, using the understanding that there are 360 one-degree rotations in a circle.

This lesson helps to build procedural skill with understanding and visualizing angle rotation.  This work develops students' understanding that an angle is measured in reference to two rays that intersect the center point of a circle. An angle that turns through 1/360th of a circle is called a one-degree angle.

Students engage in Mathematical Practice 4 (Model with mathematics) as they draw, act out, or visualize angle rotation.

Key vocabulary:

• angle
• circle
• degree
• endpoint
• line
• measure
• point
• ray

Special materials needed (optional):

• grid paper
• protractor
• ruler
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