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If the sides of the triangle are a, b and c and the length is d, then,

area of triangular cross section t = sqrt[s*(s-a)*(s-b)*(s-c)] square units where s = (a+b+c)/2

and then total area = 2*t + (a+b+c)*d suare units

= 2t + 2sd square units.

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Q: What is the formula for the area of a triangular prism?
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