1020=12*3.14*r^2-432*3.14

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Solution for 1020=12*3.14*r^2-432*3.14 equation: 


Simplifying
1020 = 12 * 3.14r2 + -432 * 3.14

Multiply 12 * 3.14
1020 = 37.68r2 + -432 * 3.14

Multiply -432 * 3.14
1020 = 37.68r2 + -1356.48

Reorder the terms:
1020 = -1356.48 + 37.68r2

Solving
1020 = -1356.48 + 37.68r2

Solving for variable 'r'.

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

Add '-37.68r2' to each side of the equation.
1020 + -37.68r2 = -1356.48 + 37.68r2 + -37.68r2

Combine like terms: 37.68r2 + -37.68r2 = 0.00
1020 + -37.68r2 = -1356.48 + 0.00
1020 + -37.68r2 = -1356.48

Add '-1020' to each side of the equation.
1020 + -1020 + -37.68r2 = -1356.48 + -1020

Combine like terms: 1020 + -1020 = 0
0 + -37.68r2 = -1356.48 + -1020
-37.68r2 = -1356.48 + -1020

Combine like terms: -1356.48 + -1020 = -2376.48
-37.68r2 = -2376.48

Divide each side by '-37.68'.
r2 = 63.07006369

Simplifying
r2 = 63.07006369

Take the square root of each side:
r = {-7.941666304, 7.941666304}

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