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

the base of a solid right prism is a triangle whose sides are 9cm, 12cm and 15cm. The height of the prism is 5cm. Then the total surface area of the prism is.

  • maths - , Wednesday, March 28, 2012 at 8:26am

    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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