250 + 2(25.50) + 105.50 = 250 + 51 + 105.50 = 406.50 <==
Maybe this will help you
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The surface area for that triangular prism is </span>126.72m.
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Next time, use your G00GLE search engine and type "find the surface area of triangular prism".
Enter in the data/numbers and it will calculate the answer along with step by step instructions on how it got the answer.
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Dilation alters the length of the sides of a triangle but the angles remain the same
So cos x will still be 8/17