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circle: πr2 |
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circle: πr2 any regular polygon: P * a / 2 (where P = the length of the perimeter, and a is the length of the apothem of the polygon [the distance from the center of the polygon to the center of one side]). a parallelogram: B * h (B [the Base] is any side, and h [height] is the distance between the lines that the sides of length B lie on) a trapezoid: (B + b) * h / 2 (B and b are the lengths of the parallel sides, and h is the distance between the lines on which the parallel sides lie) a triangle: B * h / 2 (where B is any side, and h is the distance from the line on which B lies to the other point of the triangle) |
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