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The slant height of a regular pentagonal pyramid is 6 cm, and the length of each side of the base is 3 cm. Find the lateral area.

This site explains how to do this.

http://www.mathsisfun.com/geometry/pyramids.html

LA = PHs/2 = (5*3)*6 / 2 = 45cm^2.

LA = Lateral Area.
P = Perimeter.
Hs = slant Height.

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