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Perimeter formulaPERIMETER Square 4 × side Rectangle 2 × (length + width) Parallelogram 2 × (side1 + side2) Triangle side1 + side2 + side3 Regular n-polygon n × side Trapezoid height × (base1 + base2) / 2 AREA Square side2 Rectangle length × width Parallelogram base × height Triangle base × height / 2 Trapezoid height × (base1 + base2) / 2
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