Answer:
b) 286 m²
Explanation:
A = 2(l×w + l×h + w×h)
l = 9m
w = 7m
h = 5m
A = 2(9m×7m + 9m×5m + 7m×5m)
= 2(63m² + 45m² + 35m²)
= 2×143m²
= 286 m²
B. 286 m²
Surface area = 2*(9*5) + 2*(5*7)+ 2*(9*7) = 286 (m²)
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