Posted by retangular prism on Wednesday, March 28, 2012 at 1:36am.
The surface area = 2 triangles + 3 rectangles
the area of the rectangles is easy
5(9) + 5(12) + (15)
for the area of the triangle, did you notice
15^ = 9^2+12^2 making it right-angled?
so the area of one triangle is (1/2)(9)(12) = 54
Add up all the parts
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