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30 August, 22:33

Calculate the surface area of a cylindrical drum of radius 21cm, height 50cm open at the top.

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  1. 30 August, 22:34
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    The surface area of a cylindrical drum of radius 21cm, height 50cm open at the top.

    radius R = 21cm

    height H = 50cm

    bottom surface S = 3.14 x R x R = 3.14 x 21 x 21 = 1385 square cm

    bottom circumference BS = 3.14 x 2 x R = 3.14 x 2 x 21 = 132 cm

    wall surface area WS = BS x H = 132 x 50 = 6600 square cm

    whole outside surface area S + WS = 1385 + 6600 = 7985 square cm

    whole inside and outside surface area 2 (S + WS) = 2 (1385 + 6600) = 15970 square cm
  2. 30 August, 22:53
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    9368.2293
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