Unit 3, Lesson 19, Grade 7 icon
Unit 3, Lesson 19

Unknown Area Problems on the Coordinate Plane

EngageNY 45 min(s)

Students find the areas of triangles and simple polygonal regions in the coordinate plane with vertices at grid points by composing into rectangles and decomposing into triangles and quadrilaterals. Students extend their knowledge of finding area to figures on a coordinate plane. The lesson begins with a proof of the area of a parallelogram. In Grade 6, students proved the area of a parallelogram through a different approach.

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