160=4(3.14)r^2

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Solution for 160=4(3.14)r^2 equation: 


Simplifying
160 = 4(3.14) * r2

Multiply 4 * 3.14
160 = 12.56r2

Solving
160 = 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.
160 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
160 + -12.56r2 = 0.00

Add '-160' to each side of the equation.
160 + -160 + -12.56r2 = 0.00 + -160

Combine like terms: 160 + -160 = 0
0 + -12.56r2 = 0.00 + -160
-12.56r2 = 0.00 + -160

Combine like terms: 0.00 + -160 = -160
-12.56r2 = -160

Divide each side by '-12.56'.
r2 = 12.7388535

Simplifying
r2 = 12.7388535

Take the square root of each side:
r = {-3.569153051, 3.569153051}

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