Answer:
the surface area of the prism = 378 cm³
Step-by-step explanation:
Let S be the surface area of the prism
B be the base of the prism
h be the height of the prism
T be the lateral surface area of the prism
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Formula
S = 2B + T
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[tex]\begin{aligned}B &=\frac{9 \times 12}{2} \\&=54\end{aligned}[/tex]
[tex]\begin{aligned}T &=7,5 \times(9+12+15) \\&=270\end{aligned}[/tex]
[tex]\begin{aligned}S &=2 B+T \\&=2 \times(54)+270 \\&=378\end{aligned}[/tex]
