4=(4)3.14r^2

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


Simplifying
4 = (4) * 3.14r2

Multiply 4 * 3.14
4 = 12.56r2

Solving
4 = 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.
4 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
4 + -12.56r2 = 0.00

Add '-4' to each side of the equation.
4 + -4 + -12.56r2 = 0.00 + -4

Combine like terms: 4 + -4 = 0
0 + -12.56r2 = 0.00 + -4
-12.56r2 = 0.00 + -4

Combine like terms: 0.00 + -4 = -4
-12.56r2 = -4

Divide each side by '-12.56'.
r2 = 0.3184713376

Simplifying
r2 = 0.3184713376

Take the square root of each side:
r = {-0.564332648, 0.564332648}

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