The total surface area of a trapezoidal prism is 252 m². Therefore, option A is the correct answer.
Give that, a=9 m, b=6 m, c=9 m, d=12 m, h=8 m and l=3 m.
What is the formula to find the total surface area of the trapezoidal prism?
The total surface area of trapezoidal prism = h (b + d) + l (a + b + c + d) unit square.
Where, a, b, c, and d are four sides of the trapezium, h is the height of the prism and l is the length of the prism.
Now, the total surface area=8(6+12)+3(9+6+9+12) m²
=144+108=252 m²
Therefore, option A is the correct answer.
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