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5 December, 11:48

Find the surface area of a sphere with a circumference of 40 ft. Round to the nearest tenth.

a) 6.4

b) 509.3

c) 245.6

d) 40.5

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Answers (1)
  1. 5 December, 12:23
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    The circumference of the sphere is calculated through the equation, C = 2πr. Rearranging the equation gives an equation for r which is r = C/2π. Substituting,

    r = 40 ft / 2π = 6.366 ft

    The equation for the surface area of the sphere is SA = 4πr². Substituting the value of radius,

    SA = 4π x (6.366 ft) ² = 509.30 ft²

    Thus, the answer is letter B. 509.3 ft².
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