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Section: G.5.2

Area and perimeter on the coordinate plane

Use coordinates to compute perimeters of polygons and areas of triangles and rectangles

In this unit students give more sophisticated, although still informal, arguments for the circumference, area, and volume formulas that they learned in earlier grades. These arguments rely on dissections, informal limits, and Cavalieri’s Principle. After giving arguments for the volume formulas, students use these formulas in solving a variety of modeling problems, including problems that involve density.

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1 Triangle Perimeters

2 Squares on a coordinate grid