Add all side lengths - perimeter of rectangle , Add all sides or 4 ✖ side  - perimeter of square , length ✖ width - Area of rectangle , side ✖ side  (side2) - Area of square, base ✖ height - Area of parallelogram, 1/2 base ✖ height - Area of Triangle , ⎍r2 - Area of circle , 2⎍r, or ⎍d - circumference of circle ,

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