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A regular rectangular pyramid has a base and lateral faces that are congruent equilateral triangles. it has a lateral surface area of 72 square centimeters. what is the surface area of the regular triangular pyramid?

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musiclover10045

if i understand the question correctly:

square pyramid has 4 sides

72/4 = 18

 area of each side

 so a triangular pyramid has 3 sides

 18 *3 = 54 square cm