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    Question

    The lateral surface (in cm²) of a right prism 16 cm

    high standing on an isosceles triangle, each of whose equal sides is 12 cm and the other side is 16 cm, is:
    A 480 Correct Answer Incorrect Answer
    B 630 Correct Answer Incorrect Answer
    C 360 Correct Answer Incorrect Answer
    D 640 Correct Answer Incorrect Answer

    Solution

    The dimensions of each base are:  a =12 cm  b = 12 cm  c = 16 cm  The height of the triangular prism = 16 cm.  Thus, the lateral area of triangular prism = (a + b + c ) h = (12 + 12 + 16) 16  = (40) x 16   = 640 cm²

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