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2 January, 21:05

A cylinder has a circumference of cm and a height that is half the radius. What is the total surface area of the cylinder?

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  1. 3 January, 00:07
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    Circumference: 12 π

    2 r π = 12 π

    r = 12 π : 2 π

    r = 6 cm, h = 6 : 2 = 3 cm

    The total surface area of the cylinder:

    S A = 2 · r² π + 2 r h π =

    = 2 · 6² π + 2 · 6 · 3 π = 72 π + 36 π = 108 π cm²

    Answer: The total surface is 108 π cm².
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