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14 January, 08:55

A cone has a volume of 2560π cm cubed and a heigh of 30 cm.

a) Find the radius of the cone.

b) Find the slant height of the cone.

c) Find the LA of the cone.

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  1. 14 January, 12:32
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    r = 16 cm

    g = 34 cm

    LA = 1708.16 cm^2

    Step-by-step explanation:

    We have that for the cone, the formula is as follows:

    v = pi / 3 * r ^ 2 * h

    the first thing they ask is to calculate the radius, therefore we solve for r

    r ^ 2 = 3 * v / (pi * h)

    replacing the volume and height, it remains:

    r ^ 2 = 3 * 2560 * pi / (pi * 30)

    r ^ 2 = 3 * 2560/30 = 256

    r = 16

    Now, to calculate the slant height, that is to say g, we can calculate it knowing the height and the radius:

    g ^ 2 = r ^ 2 + h ^ 2

    g ^ 2 = 16 ^ 2 + 30 ^ 2

    g ^ 2 = 1156

    g = 34

    The lateral area of the cone is given by the following equation:

    LA = pi * r * g

    replacing

    LA = 3.14 * 16 * 34

    LA = 1708.16 cm ^ 2

    the lateral area is 1708.16 cm ^ 2
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