If it's not what You are looking for type in the equation solver your own equation and let us solve it.
r in (-oo:+oo)
41.12 = (2*3.14*r)/2 // - (2*3.14*r)/2
41.12-((2*3.14*r)/2) = 0
41.12-3.14*r = 0
41.12-3.14*r = 0 // - 41.12
-3.14*r = -41.12 // : -3.14
r = -41.12/(-3.14)
r = 13.0955414
r = 13.0955414
| Cos(54)=x/30 | | 4-3/y-3=-3/y-2 | | a/24-21=7 | | 2a-7=7 | | x=9+13 | | 15/D=.095x | | 3x-5+5(x-3)=12 | | 6a-7=2(2a-13) | | -7b-5=-3(b+2) | | 41.12=3.14d/2 | | 2x=6y+y^2+11 | | x/3-5/x=x | | 8y-72=3y | | f(3x)=3x^2+3 | | s^2+2*s+4=0 | | 12y+3=16y | | 6n^2+9n+5=11 | | 7(1x-6)=-42 | | 2k^2-5k-5=-7 | | 6+2x=-28 | | 1-3(x+3)=5x-24 | | 6(7+3x)=-66 | | 3a^2+4a-1=6 | | Axb=x(5) | | V^2-3v=4 | | 7-4(29/14) | | 14+14x=-2-34 | | 7-4x29/14 | | 2(x^2-27x)=0 | | 4x29/14 | | 6b^2-b-22=0 | | Y=3-5sinx |