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Grade 3 - Measurement and Data
Standard 3.MD.D.8 - Compare two figures that have either the same area or perimeter. Use the information to find the missing dimensions.
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.