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geometry

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If a circle has an area of 25 pi cm squared, find the circumference of the circle?
a. 5 squared cm
b. 10 squared cm
c. 50 sqaurred cm
d. 156.25 squared cm

  • geometry - ,

    a=pi*r^2
    25pi = pi*r^2
    25 = r^2
    r = 5

    so, c = 2pi*r = 10pi

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