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January 30, 2015

January 30, 2015

Posted by **retangular prism** on Wednesday, March 28, 2012 at 1:36am.

- maths -
**Reiny**, Wednesday, March 28, 2012 at 8:26amThe 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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