Answer:
261 in²
Step-by-step explanation:
The surface area of a square pyramid can be found from the formula ...
A = s(s +2h)
where s is the side length of the base and h is the slant height of a face.
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For s = 9 in, and h = 10 in, the surface area is ...
A = (9 in)(9 in +2×10 in) = (9·29) in² = 261 in²
The surface area of the square pyramid is 261 square inches.
