2826=3.14(r*r)

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Solution for 2826=3.14(r*r) equation: 


Simplifying
2826 = 3.14(r * r)

Multiply r * r
2826 = 3.14(r2)

Solving
2826 = 3.14r2

Solving for variable 'r'.

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

Add '-3.14r2' to each side of the equation.
2826 + -3.14r2 = 3.14r2 + -3.14r2

Combine like terms: 3.14r2 + -3.14r2 = 0.00
2826 + -3.14r2 = 0.00

Add '-2826' to each side of the equation.
2826 + -2826 + -3.14r2 = 0.00 + -2826

Combine like terms: 2826 + -2826 = 0
0 + -3.14r2 = 0.00 + -2826
-3.14r2 = 0.00 + -2826

Combine like terms: 0.00 + -2826 = -2826
-3.14r2 = -2826

Divide each side by '-3.14'.
r2 = 900

Simplifying
r2 = 900

Take the square root of each side:
r = {-30, 30}

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