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26 December, 22:02

What is the surface area of a cone with diameter 28cm and height 22cm

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  1. 26 December, 23:12
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    The surface area of a cone is : pi•r•slant height + pi•r^2

    If d=28 then r=14

    Use the pythagorean theorem to find the slant height c^2 = 14^2 + 22^2

    C^2 = 680

    C = 26.08 (rounded)

    Pi•14•26.08 + 196pi = 1,762.67 squared cm
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