Question

the area of the base (B) of a triangular pyramid is 28 cm. The perimeter (p) is 20 cm, and the slant height (S) is 5 cm. Determine the pyramid's surface area. A) 96 cm2 B) 128 cm2 C) 225 cm2 D) 78 cm2

Answer 1

Answer: D. 78cm2

Step-by-step explanation:

SA=B+1/2ph

SA=28+1/2(20)(5)

SA=78cm2

Answer 2

Answer:

78 cm2

SA = B +  

1

2

ph

SA = 28 +  

1

2

(20)(5)

SA = 78 cm2