SOLUTION: A pyramid has a square base with an area of 100 square inches. Each of its triangular faces has a height of 10 inches. What is the surface area of the pyramid?

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Question 550018: A pyramid has a square base with an area of 100 square inches. Each of its triangular faces has a height of 10 inches. What is the surface area of the pyramid?
Answer by jim_thompson5910(35256) About Me  (Show Source):
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Since the area of the base is 100 sq in. this means that the side length of the base is s=sqrt%28100%29=10 inches. So the area of each triangular face is A=%2810%2A10%29%2F2+=+100%2F2+=+50 square inches.


So


Surface Area of Pyramid = Area of base + 4*Area of Triangular Face


Surface Area of Pyramid = 100 + 4*50


Surface Area of Pyramid = 100 + 200


Surface Area of Pyramid = 300 square inches