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Lesson Plan

Classify triangles by examining their angles

teaches Common Core State Standards CCSS.Math.Content.4.G.A.2
teaches Common Core State Standards CCSS.Math.Practice.MP7

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Big Ideas: Geometric properties can be used to determine how shapes are alike and different. This lesson builds on students' knowledge of geometric attributes. The task asks students to sort various triangles into three categories using just one attribute. Through exploration of the triangles, students will see that they can group triangles together based on angle type or based on side length. Their work in classifying triangles builds towards students' future work in examining angle measurement. Vocabulary: acute triangle, equilateral triangle, isosceles triangle, obtuse triangle, right triangle, scalene triangle
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