Math Question

Linda is adding padding to all of the surfaces inside her attic for extra warmth in the winter. She needs to find the approximate surface area of the attic, including the walls, floor, and ceiling. The attic is in the shape of a triangular prism. Linda draws the net and writes the expression below to represent the surface area of the attic. Are Linda's net and expression correct?
Expression for Surface Area of Attic:
45(40+25+25)+\frac{1}{2}(40 \times 15)



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