64=4(3.14)r^2

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Solution for 64=4(3.14)r^2 equation: 


Simplifying
64 = 4(3.14) * r2

Multiply 4 * 3.14
64 = 12.56r2

Solving
64 = 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.
64 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
64 + -12.56r2 = 0.00

Add '-64' to each side of the equation.
64 + -64 + -12.56r2 = 0.00 + -64

Combine like terms: 64 + -64 = 0
0 + -12.56r2 = 0.00 + -64
-12.56r2 = 0.00 + -64

Combine like terms: 0.00 + -64 = -64
-12.56r2 = -64

Divide each side by '-12.56'.
r2 = 5.095541401

Simplifying
r2 = 5.095541401

Take the square root of each side:
r = {-2.257330592, 2.257330592}

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