A regular triangular pyramid has a base and lateral faces that are congruent equilateral triangles. It has a lateral surface area of 72 square centimetres. What is the surface area of the regular triangular pyramid?

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step-by-step explanation:

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step-by-step explanation:

the answer is 13 cm

m∠5 + m∠3 = m∠1   is true.

m∠5 + m∠6 = 180 is true

m∠2 +m∠3 = m∠6   is true

m∠2 +m∠3 +m∠5 = 180   is true