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Musya8 [376]
3 years ago
6

Item 12 a regular triangular pyramid has a base and lateral faces that are congruent equilateral triangles. it has a lateral sur

face area of 57 square centimeters. what is the surface area of the regular triangular pyramid?
Mathematics
2 answers:
In-s [12.5K]3 years ago
8 0

Answer:

76

Step-by-step explanation:

im short on time sorry for no explanation.

valina [46]3 years ago
6 0
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
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