# 8. Measuring angles (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.6 http://corestandards.org/Math/Content/4/MD/C/6
teaches Common Core State Standards CCSS.Math.Practice.MP5 http://corestandards.org/Math/Practice/MP5

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Lesson objective: Measure angles to whole number degrees using a protractor.

This lesson helps to build procedural skill with measuring angles. A protractor is used here because it is a tool for measuring angles. This work develops students' understanding that an angle that turns through n one-degree angles is said to have a measure of n degrees.

Students engage in Mathematical Practice 5 (Use appropriate tools strategically) as they use a protractor to measure angles.

Key vocabulary:

• acute angle
• angle
• measure
• obtuse angle
• point
• protractor
• ray
• right angle
• vertex

Special materials needed:

• AngLegs (optional)
• protractor
• ruler
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