You have given 3 dimensions and not the shape. For area you generally need two dimensions, like for a rectangle. The area of this is Length by width.
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Surface area: (2*0.5*3*4)+(3*9)+(4*9)+(5*9) = 120 square inches
5 x 4 inches = 20 inches squared.
60 cubic inches with a surface area of 94 square inches
5*4 = 20 square inches
A triangle with side lengths of 3, 4, and 5 inches is a scalene triangle.