Answer
About 124.84 m$^2$
Work Step by Step
Lateral Area=105
Base Area=$\sqrt {s(s-a)(s-b)(s-c)}$
B=$\sqrt {7.5(3.5)(2.5)(1.5)}$
B$\approx$9.92
Total Area=LA+2B
TA=105+19.84
TA=124.84
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