Answer:
207 m^2
Step-by-step explanation:
The surface area of a pyramid with side length s and slant height h is ...
SA = s^2 + 2sh
SA = s(s +2h)
= (9 m)(9 m+ 2(7 m)) = (9 m)(23 m) = 207 m^2
The surface area of the model is 207 square meters.
