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31 July, 10:33

The volumes of two spheres are 327 π in3and 8829 π in3.

a. What is the ratio of their radii?

b. What is the ratio of their surface areas?

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  1. 31 July, 12:55
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    A) Volume of the first sphere V1=4/3πr (1) ³

    Volume of the second sphere V2=4/3πr (2) ³

    V1/V2 = 4/3πr³ (1) / 4/3πr³ (2)

    V1/V2 = r³ (1) / r³ (2)

    At the same time V1/V2=327π/8829π=327/8829=1/27

    V1/V2 = r³ (1) / r³ (2) = 1/27

    r (1) / r (2) = 1/3

    b) SA (1) = 4πr² (1) SA - surface area

    SA (2) = 4πr² (2)

    SA (1) / SA (2) = 4πr² (1) / 4πr² (2) = r² (1) / r² (2)

    SA (1) / SA (2) = r² (1) / r² (2) = ((r (1) / r (2)) ² = (1/3) ²=1/9

    SA (1) / SA (2) = 1/9
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