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

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


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

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

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

Multiply 2 * 95
13602.48 = 6.28r2 + 190r

Reorder the terms:
13602.48 = 190r + 6.28r2

Solving
13602.48 = 190r + 6.28r2

Solving for variable 'r'.

Reorder the terms:
13602.48 + -190r + -6.28r2 = 190r + -190r + 6.28r2 + -6.28r2

Combine like terms: 190r + -190r = 0
13602.48 + -190r + -6.28r2 = 0 + 6.28r2 + -6.28r2
13602.48 + -190r + -6.28r2 = 6.28r2 + -6.28r2

Combine like terms: 6.28r2 + -6.28r2 = 0.00
13602.48 + -190r + -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 + 30.25477707r + r2 = 0

Move the constant term to the right:

Add '2166' to each side of the equation.
-2166 + 30.25477707r + 2166 + r2 = 0 + 2166

Reorder the terms:
-2166 + 2166 + 30.25477707r + r2 = 0 + 2166

Combine like terms: -2166 + 2166 = 0
0 + 30.25477707r + r2 = 0 + 2166
30.25477707r + r2 = 0 + 2166

Combine like terms: 0 + 2166 = 2166
30.25477707r + r2 = 2166

The r term is 30.25477707r.  Take half its coefficient (15.12738854).
Square it (228.8378840) and add it to both sides.

Add '228.8378840' to each side of the equation.
30.25477707r + 228.8378840 + r2 = 2166 + 228.8378840

Reorder the terms:
228.8378840 + 30.25477707r + r2 = 2166 + 228.8378840

Combine like terms: 2166 + 228.8378840 = 2394.837884
228.8378840 + 30.25477707r + r2 = 2394.837884

Factor a perfect square on the left side:
(r + 15.12738854)(r + 15.12738854) = 2394.837884

Calculate the square root of the right side: 48.937080869

Break this problem into two subproblems by setting 
(r + 15.12738854) equal to 48.937080869 and -48.937080869.

Subproblem 1

r + 15.12738854 = 48.937080869 Simplifying r + 15.12738854 = 48.937080869 Reorder the terms: 15.12738854 + r = 48.937080869 Solving 15.12738854 + r = 48.937080869 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-15.12738854' to each side of the equation. 15.12738854 + -15.12738854 + r = 48.937080869 + -15.12738854 Combine like terms: 15.12738854 + -15.12738854 = 0.00000000 0.00000000 + r = 48.937080869 + -15.12738854 r = 48.937080869 + -15.12738854 Combine like terms: 48.937080869 + -15.12738854 = 33.809692329 r = 33.809692329 Simplifying r = 33.809692329

Subproblem 2

r + 15.12738854 = -48.937080869 Simplifying r + 15.12738854 = -48.937080869 Reorder the terms: 15.12738854 + r = -48.937080869 Solving 15.12738854 + r = -48.937080869 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-15.12738854' to each side of the equation. 15.12738854 + -15.12738854 + r = -48.937080869 + -15.12738854 Combine like terms: 15.12738854 + -15.12738854 = 0.00000000 0.00000000 + r = -48.937080869 + -15.12738854 r = -48.937080869 + -15.12738854 Combine like terms: -48.937080869 + -15.12738854 = -64.064469409 r = -64.064469409 Simplifying r = -64.064469409

Solution

The solution to the problem is based on the solutions from the subproblems. r = {33.809692329, -64.064469409}

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