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Simplifying
64 * 3.1415926535897932384626433832795 = r2
Multiply 64 * 3.1415926535897932384626433832795
201.0619298 = r2
Solving
201.0619298 = r2
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '-1r2' to each side of the equation.
201.0619298 + -1r2 = r2 + -1r2
Combine like terms: r2 + -1r2 = 0
201.0619298 + -1r2 = 0
Add '-201.0619298' to each side of the equation.
201.0619298 + -201.0619298 + -1r2 = 0 + -201.0619298
Combine like terms: 201.0619298 + -201.0619298 = 0.0000000
0.0000000 + -1r2 = 0 + -201.0619298
-1r2 = 0 + -201.0619298
Combine like terms: 0 + -201.0619298 = -201.0619298
-1r2 = -201.0619298
Divide each side by '-1'.
r2 = 201.0619298
Simplifying
r2 = 201.0619298
Take the square root of each side:
r = {-14.179630806, 14.179630806}
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