1281.2456=4*3.14*r^2

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Solution for 1281.2456=4*3.14*r^2 equation: 


Simplifying
1281.2456 = 4 * 3.14r2

Multiply 4 * 3.14
1281.2456 = 12.56r2

Solving
1281.2456 = 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.
1281.2456 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
1281.2456 + -12.56r2 = 0.00

Add '-1281.2456' to each side of the equation.
1281.2456 + -1281.2456 + -12.56r2 = 0.00 + -1281.2456

Combine like terms: 1281.2456 + -1281.2456 = 0.0000
0.0000 + -12.56r2 = 0.00 + -1281.2456
-12.56r2 = 0.00 + -1281.2456

Combine like terms: 0.00 + -1281.2456 = -1281.2456
-12.56r2 = -1281.2456

Divide each side by '-12.56'.
r2 = 102.01

Simplifying
r2 = 102.01

Take the square root of each side:
r = {-10.1, 10.1}

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