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19 December, 13:01

The perimeter of the base of the regular quadrilateral pyramid is P = 30 cm. Find the sum of all edges of this pyramid, if the perimeter of a lateral face is 27.5 cm

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  1. 19 December, 15:21
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    The perimeters of two opposite triangular faces includes all 4 slant edges and 2 of 4 base edges. The other two base edges are half the base perimeter, so the total length of all edges is

    ... 2 * (27.5 cm) + (1/2) * (30 cm) = 70 cm
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