46=4(3.14)(r*r)

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Solution for 46=4(3.14)(r*r) equation: 


Simplifying
46 = 4(3.14)(r * r)

Multiply r * r
46 = 4 * 3.14(r2)

Multiply 4 * 3.14
46 = 12.56r2

Solving
46 = 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.
46 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
46 + -12.56r2 = 0.00

Add '-46' to each side of the equation.
46 + -46 + -12.56r2 = 0.00 + -46

Combine like terms: 46 + -46 = 0
0 + -12.56r2 = 0.00 + -46
-12.56r2 = 0.00 + -46

Combine like terms: 0.00 + -46 = -46
-12.56r2 = -46

Divide each side by '-12.56'.
r2 = 3.662420382

Simplifying
r2 = 3.662420382

Take the square root of each side:
r = {-1.913745119, 1.913745119}

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