37675.4449=4/7*3.14r^2

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Solution for 37675.4449=4/7*3.14r^2 equation: 


r in (-oo:+oo)

37675.4449 = 3.14*(4/7)*r^2 // - 3.14*(4/7)*r^2

37675.4449-(3.14*(4/7)*r^2) = 0

37675.4449-1.79428571*r^2 = 0

-1.79428571*r^2 = -37675.4449 // : -1.79428571

r^2 = 20997.46137977

r^2 = 20997.46137977 // ^ 1/2

abs(r) = 20997.46137977^(1/2)

r = 20997.46137977^(1/2) or r = -20997.46137977^(1/2)

r in { 20997.46137977^(1/2), -20997.46137977^(1/2) }

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