Circumference of a circle - 2╥r, Area of a circle - ╥r2, Perimeter of a polygon - s1 + s2 + s3 + s4, Area of a rectangle - L x W, Area of a Triangle - bh/2, Area of a Trapezoid - (b1 + b2 / 2)/2 x h, Area of Square - s2, Pythagorean Theorem - a2 + b2 = c2,

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