SOLUTION: Benjamin made a model of a square pyramid with a square base5 inches long and a slant height of nine inches as shown. The surface area of the pyramid is given by the formula SA=

Question 954361: Benjamin made a model of a square pyramid with a square base5 inches long and a slant height of nine inches as shown.
The surface area of the pyramid is given by the formula SA= B+1/2 p
What is the surface of Benjamin's pyramid?
Answer by macston(5194) (Show Source): You can put this solution on YOUR website!
B=area of base; P=perimeter of base=20 in; s=slant height=9 inches; b=edge of base=5 inches
The formula for surface area is:

The is derived from the formula for the area of a triangle:
where b is edge of the base is the area of one side.
would be all four sides. P=4b so 1/2P=2b and we wind up with
instead of .
But the s is missing from the given formula:If you use the given formula, you will not get the true correct answer, but if you use the correct formula, you will not get an answer for the given formula. It's your choice. Check the original problem to see if you overlooked the s when posting.

=
ANSWER: The surface area is 115 square inches.

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