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zalisa [80]
2 years ago
8

A regular triangular pyramid has a base and lateral faces that are congruent equilateral triangles. It has a lateral surface are

a of 81 square feet. What is the surface area of the regular triangular pyramid?
Mathematics
1 answer:
TEA [102]2 years ago
4 0
We know that

[lateral surface area of a regular triangular pyramid]=3*[area of one <span>equilateral triangle]
so
[area of one </span>equilateral triangle]=lateral surface/3-----> 81/3-----> 27 ft²

[<span>surface area of the regular triangular pyramid]=lateral area+area of the base

area of the base is equals to the area of the lateral sides because are </span>equilateral triangles

therefore
area of the base=27 ft²

[surface area of the regular triangular pyramid]=81+27----> 108 ft²

the answer is
<span>the surface area of the regular triangular pyramid is 108 ft</span>²
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