3.MD.8. Solve real world and mathematical problems involving perimeters of polygons, including finding the perimeter given the side lengths, finding an unknown side length, and exhibiting rectangles with the same perimeter and different areas or with the same area and different perimeters.
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Tags : Understand perimeter, word and mathematical problems involving perimeter, perimeter of polygons, compare perimeters, find unknown side given the perimeter and length of remaining sides.