10. Program a robot to turn on an angle (A)

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.Content.4.MD.C.5b http://corestandards.org/Math/Content/4/MD/C/5/b
teaches Common Core State Standards CCSS.Math.Practice.MP5 http://corestandards.org/Math/Practice/MP5

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Lesson objective: Apply knowledge of angle construction and measurement to a real-world problem.

This lesson provides an opportunity for students to apply their knowledge and understanding of angle measurement to a real-life situation. Students are asked to construct a triangular path that a robot will travel given a set of directions that include turning on a specific angle.

Key Concept students will use:

• Points, lines, line segments, and rays have specific properties that are maintained when combined to make geometric figures. One of these new figures, an angle, is a geometric figure that is created wherever two rays share a common endpoint.

• 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.

• An angle that turns through n one-degree angles is said to have a measure of n degrees.

Skills students will use:

• Exploring standard units of length; (Grade 2, Unit 2)
• Solving problems involving shapes; (Grade 3, Unit 13)

Students engage in Mathematical Practice 5 (Use appropriate tools strategically) as they use a ruler, protractor, and other materials to construct 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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