25.748=2*3.14*r^2+2*3.14*r^2*3.1

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Solution for 25.748=2*3.14*r^2+2*3.14*r^2*3.1 equation: 


Simplifying
25.748 = 2 * 3.14r2 + 2 * 3.14r2 * 3.1

Multiply 2 * 3.14
25.748 = 6.28r2 + 2 * 3.14r2 * 3.1

Reorder the terms for easier multiplication:
25.748 = 6.28r2 + 2 * 3.14 * 3.1r2

Multiply 2 * 3.14
25.748 = 6.28r2 + 6.28 * 3.1r2

Multiply 6.28 * 3.1
25.748 = 6.28r2 + 19.468r2

Combine like terms: 6.28r2 + 19.468r2 = 25.748r2
25.748 = 25.748r2

Solving
25.748 = 25.748r2

Solving for variable 'r'.

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

Add '-25.748r2' to each side of the equation.
25.748 + -25.748r2 = 25.748r2 + -25.748r2

Combine like terms: 25.748r2 + -25.748r2 = 0.000
25.748 + -25.748r2 = 0.000

Add '-25.748' to each side of the equation.
25.748 + -25.748 + -25.748r2 = 0.000 + -25.748

Combine like terms: 25.748 + -25.748 = 0.000
0.000 + -25.748r2 = 0.000 + -25.748
-25.748r2 = 0.000 + -25.748

Combine like terms: 0.000 + -25.748 = -25.748
-25.748r2 = -25.748

Divide each side by '-25.748'.
r2 = 1

Simplifying
r2 = 1

Take the square root of each side:
r = {-1, 1}

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