13=3.14(3.14)(r^2)

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Solution for 13=3.14(3.14)(r^2) equation: 


Simplifying
13 = 3.14(3.14)(r2)

Multiply 3.14 * 3.14
13 = 9.8596r2

Solving
13 = 9.8596r2

Solving for variable 'r'.

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

Add '-9.8596r2' to each side of the equation.
13 + -9.8596r2 = 9.8596r2 + -9.8596r2

Combine like terms: 9.8596r2 + -9.8596r2 = 0.0000
13 + -9.8596r2 = 0.0000

Add '-13' to each side of the equation.
13 + -13 + -9.8596r2 = 0.0000 + -13

Combine like terms: 13 + -13 = 0
0 + -9.8596r2 = 0.0000 + -13
-9.8596r2 = 0.0000 + -13

Combine like terms: 0.0000 + -13 = -13
-9.8596r2 = -13

Divide each side by '-9.8596'.
r2 = 1.318511907

Simplifying
r2 = 1.318511907

Take the square root of each side:
r = {-1.148264737, 1.148264737}

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