94=4(3.14)r^2

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Solution for 94=4(3.14)r^2 equation: 


Simplifying
94 = 4(3.14) * r2

Multiply 4 * 3.14
94 = 12.56r2

Solving
94 = 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.
94 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
94 + -12.56r2 = 0.00

Add '-94' to each side of the equation.
94 + -94 + -12.56r2 = 0.00 + -94

Combine like terms: 94 + -94 = 0
0 + -12.56r2 = 0.00 + -94
-12.56r2 = 0.00 + -94

Combine like terms: 0.00 + -94 = -94
-12.56r2 = -94

Divide each side by '-12.56'.
r2 = 7.484076433

Simplifying
r2 = 7.484076433

Take the square root of each side:
r = {-2.73570401, 2.73570401}

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