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Lesson Plan

Develop a formula for finding the area of triangles by using rectangles

teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards CCSS.Math.Content.6.G.A.1 http://corestandards.org/Math/Content/6/G/A/1
teaches Common Core State Standards CCSS.Math.Practice.MP4 http://corestandards.org/Math/Practice/MP4
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Big Ideas: The area of a triangle is half the area of a rectangle or parallelogram The formula used to find the area of any triangle is (base x height) / 2 or ½(base x height) This lesson builds on students’ work with solving for the areas of triangles. This task guides students as they develop a formula for finding the area of triangles and apply that formula to real-world situations, setting them up to discover that the area of a triangle is half the area of a rectangle (right triangles) and a parallelogram (non-right triangles). The mathematical concepts in this lesson build toward students’ future work with finding the areas of 2-D composite figures, surface area, and the slicing of 3-D figures in grades 6-8. Vocabulary: area, right triangle, non-right triangle (equilateral, isosceles, scalene), base, height, parallelogram (and its properties), rectangle (and its properties) Special Materials: Grid Paper Supplementary Handout
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