84.9058=3.14*R^2

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Solution for 84.9058=3.14*R^2 equation: 


Simplifying
84.9058 = 3.14R2

Solving
84.9058 = 3.14R2

Solving for variable 'R'.

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

Add '-3.14R2' to each side of the equation.
84.9058 + -3.14R2 = 3.14R2 + -3.14R2

Combine like terms: 3.14R2 + -3.14R2 = 0.00
84.9058 + -3.14R2 = 0.00

Add '-84.9058' to each side of the equation.
84.9058 + -84.9058 + -3.14R2 = 0.00 + -84.9058

Combine like terms: 84.9058 + -84.9058 = 0.0000
0.0000 + -3.14R2 = 0.00 + -84.9058
-3.14R2 = 0.00 + -84.9058

Combine like terms: 0.00 + -84.9058 = -84.9058
-3.14R2 = -84.9058

Divide each side by '-3.14'.
R2 = 27.04006369

Simplifying
R2 = 27.04006369

Take the square root of each side:
R = {-5.200006124, 5.200006124}

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