Question

Item 12 a regular triangular pyramid has a base and lateral faces that are congruent equilateral triangles. it has a lateral surface area of 57 square centimeters. what is the surface area of the regular triangular pyramid?

Answer 1

Answer:

76

Step-by-step explanation:

im short on time sorry for no explanation.

Answer 2

Let SA =surface area, la=lateral area, b=base, h=height, l=slant height;

b=l

57=3(1/2b²) 

57/3*2=b²

b= √38

SA= 1/2 (√38)²+57 cm²= 94 cm²