A square pyramid is made up of a base with a side length of 10 inches and faces that are triangles with a height of 12 inches. What is the surface area of the square pyramid?

The square base has area 10 × 10 = 100 square inches. Each of the four triangular faces has area ½ × 10 × 12 = 60 square inches, so their total area is 4 × 60 = 240 square inches. Adding the base gives 100 + 240 = 340 square inches, choice D.

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