geometry

Find the surface area of a sphere with a circumference of 155 mm. Round to the nearest tenth.

Help please

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  1. c = 2pi r
    so,
    r = c/2pi

    a = 4pi r^2 = 4pi (c/2pi)^2 = c^2/pi

    a = 155^2/pi = 7647.4

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  2. Can someone answer this question with the circumference being 180?

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