100=4(3.14)r^2

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Solution for 100=4(3.14)r^2 equation: 


Simplifying
100 = 4(3.14) * r2

Multiply 4 * 3.14
100 = 12.56r2

Solving
100 = 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.
100 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
100 + -12.56r2 = 0.00

Add '-100' to each side of the equation.
100 + -100 + -12.56r2 = 0.00 + -100

Combine like terms: 100 + -100 = 0
0 + -12.56r2 = 0.00 + -100
-12.56r2 = 0.00 + -100

Combine like terms: 0.00 + -100 = -100
-12.56r2 = -100

Divide each side by '-12.56'.
r2 = 7.961783439

Simplifying
r2 = 7.961783439

Take the square root of each side:
r = {-2.82166324, 2.82166324}

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