13602.48=2*3.14*r^2+2*3.14*r*95

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Solution for 13602.48=2*3.14*r^2+2*3.14*r*95 equation:


Simplifying
13602.48 = 2 * 3.14r2 + 2 * 3.14r * 95

Multiply 2 * 3.14
13602.48 = 6.28r2 + 2 * 3.14r * 95

Reorder the terms for easier multiplication:
13602.48 = 6.28r2 + 2 * 3.14 * 95r

Multiply 2 * 3.14
13602.48 = 6.28r2 + 6.28 * 95r

Multiply 6.28 * 95
13602.48 = 6.28r2 + 596.6r

Reorder the terms:
13602.48 = 596.6r + 6.28r2

Solving
13602.48 = 596.6r + 6.28r2

Solving for variable 'r'.

Reorder the terms:
13602.48 + -596.6r + -6.28r2 = 596.6r + -596.6r + 6.28r2 + -6.28r2

Combine like terms: 596.6r + -596.6r = 0.0
13602.48 + -596.6r + -6.28r2 = 0.0 + 6.28r2 + -6.28r2
13602.48 + -596.6r + -6.28r2 = 6.28r2 + -6.28r2

Combine like terms: 6.28r2 + -6.28r2 = 0.00
13602.48 + -596.6r + -6.28r2 = 0.00

Begin completing the square.  Divide all terms by
-6.28 the coefficient of the squared term: 

Divide each side by '-6.28'.
-2166 + 95r + r2 = 0

Move the constant term to the right:

Add '2166' to each side of the equation.
-2166 + 95r + 2166 + r2 = 0 + 2166

Reorder the terms:
-2166 + 2166 + 95r + r2 = 0 + 2166

Combine like terms: -2166 + 2166 = 0
0 + 95r + r2 = 0 + 2166
95r + r2 = 0 + 2166

Combine like terms: 0 + 2166 = 2166
95r + r2 = 2166

The r term is 95r.  Take half its coefficient (47.5).
Square it (2256.25) and add it to both sides.

Add '2256.25' to each side of the equation.
95r + 2256.25 + r2 = 2166 + 2256.25

Reorder the terms:
2256.25 + 95r + r2 = 2166 + 2256.25

Combine like terms: 2166 + 2256.25 = 4422.25
2256.25 + 95r + r2 = 4422.25

Factor a perfect square on the left side:
(r + 47.5)(r + 47.5) = 4422.25

Calculate the square root of the right side: 66.5

Break this problem into two subproblems by setting 
(r + 47.5) equal to 66.5 and -66.5.

Subproblem 1

r + 47.5 = 66.5 Simplifying r + 47.5 = 66.5 Reorder the terms: 47.5 + r = 66.5 Solving 47.5 + r = 66.5 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-47.5' to each side of the equation. 47.5 + -47.5 + r = 66.5 + -47.5 Combine like terms: 47.5 + -47.5 = 0.0 0.0 + r = 66.5 + -47.5 r = 66.5 + -47.5 Combine like terms: 66.5 + -47.5 = 19 r = 19 Simplifying r = 19

Subproblem 2

r + 47.5 = -66.5 Simplifying r + 47.5 = -66.5 Reorder the terms: 47.5 + r = -66.5 Solving 47.5 + r = -66.5 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-47.5' to each side of the equation. 47.5 + -47.5 + r = -66.5 + -47.5 Combine like terms: 47.5 + -47.5 = 0.0 0.0 + r = -66.5 + -47.5 r = -66.5 + -47.5 Combine like terms: -66.5 + -47.5 = -114 r = -114 Simplifying r = -114

Solution

The solution to the problem is based on the solutions from the subproblems. r = {19, -114}

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