SOLUTION: What is the surface area of a square pyramid with a square base of 12-inches and a slant height of 15-inches?

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Question 764310: What is the surface area of a square pyramid with a square base of 12-inches and a slant height of 15-inches?
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

Let's find the area of the square base
SA%5Bb%5D=+12+%2A12=144in%5E2
Now let's find the area of one triangular surface its lateral h=15in base b=12in

so area SA%5Bts%5D=%2815in%2A12in%29%2F2=15in+%2A6in=90in%5E2
there are 4 surfaces like this, in total SA%5Bts%5D=90in%5E2%2A4=360in%5E2
total surface area SA=360in%5E2%2B144in%5E2=504in%5E2