16277.76=4*3.14*r^2

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Solution for 16277.76=4*3.14*r^2 equation: 


Simplifying
16277.76 = 4 * 3.14r2

Multiply 4 * 3.14
16277.76 = 12.56r2

Solving
16277.76 = 12.56r2

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '-12.56r2' to each side of the equation.
16277.76 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
16277.76 + -12.56r2 = 0.00

Add '-16277.76' to each side of the equation.
16277.76 + -16277.76 + -12.56r2 = 0.00 + -16277.76

Combine like terms: 16277.76 + -16277.76 = 0.00
0.00 + -12.56r2 = 0.00 + -16277.76
-12.56r2 = 0.00 + -16277.76

Combine like terms: 0.00 + -16277.76 = -16277.76
-12.56r2 = -16277.76

Divide each side by '-12.56'.
r2 = 1296

Simplifying
r2 = 1296

Take the square root of each side:
r = {-36, 36}

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