4924.0224=4*3.14*r^2

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Solution for 4924.0224=4*3.14*r^2 equation: 


Simplifying
4924.0224 = 4 * 3.14r2

Multiply 4 * 3.14
4924.0224 = 12.56r2

Solving
4924.0224 = 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.
4924.0224 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
4924.0224 + -12.56r2 = 0.00

Add '-4924.0224' to each side of the equation.
4924.0224 + -4924.0224 + -12.56r2 = 0.00 + -4924.0224

Combine like terms: 4924.0224 + -4924.0224 = 0.0000
0.0000 + -12.56r2 = 0.00 + -4924.0224
-12.56r2 = 0.00 + -4924.0224

Combine like terms: 0.00 + -4924.0224 = -4924.0224
-12.56r2 = -4924.0224

Divide each side by '-12.56'.
r2 = 392.04

Simplifying
r2 = 392.04

Take the square root of each side:
r = {-19.8, 19.8}

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