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16 October, 21:15

A tower has a cone-shaped attic. The diameter of the attic is 18 ft and its height is 18 ft. What is the volume of the space in the attic? Enter your answer as a decimal in the box. Use 3.14 for pi.

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  1. 16 October, 21:38
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    Volume of a cone=Pi*r^2 h/3. So the radius will equal 9, since it is half of the diameter. So 3.14 * (9^2) * (18/3) = 3.14*81*6 = 1526.81 feet
  2. 16 October, 21:39
    0
    Vcone = (1/3) hpir^2

    d/2=r

    18/2=d/2=9=r

    h=18

    v = (1/3) (18) (pi) (9^2)

    V = (6) (pi) (81)

    V=486pi

    V=1526.04 ft³
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