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Musya8 [376]
3 years ago
8

A triangular pyramid has lateral faces with bases of 4 meters and heights of 13 meters. The area of the base of the pyramid is 6

.9 square meters. What is the surface area of the pyramid?
Mathematics
1 answer:
Nutka1998 [239]3 years ago
3 0

Answer:

84.9m²

Step-by-step explanation:

Surface area Formula

SA = A +  \frac{3}{2} bh

A is the area if the base, b is the length of the base on one of the faces and h is the height of one of the faces.

a = 6.9

b = 4

h = 13

Formula

SA = 6.9 +  \frac{3}{2} (4 \times 13

SA = 6.9 +  \frac{3}{2} (52)

SA = 6.9 + 78

SA = 84.9

The surface area is 84.9m²

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