ElectricPavlov

User Bosco pointed out an error in my solution..... 

Here is a correction 

Interior angle + exterior angle = 180 degrees 

  2 e     + e = 180 

    e = 60 degrees     so interior angle = 120 degrees 

Sum of interior angles of n-gon is  ( n-2)*180 

   each angle is then   (n-2)*180 / n    and this equals  120  degrees   solve for n 

         (n-2)*180 / n = 120 

           180n -360 = 120 n 

                n =6 sides 

Maybe a bit simpler to realize exterior angles sum to 360 

                        n (60) = 360 

                             n = 6 sides 

THANX , Bosco !! 

s = (a+b+c)/2       Multiply both sides by '2' 

2s = a* b + c        Subtract  b and c from both sides 

a = 2s - b - c 

15000 drops *  1 minute / 41 drops = ~ 366 minutes

Interior angle + exterior angle = 180 degrees 

  23 e     + e = 180 

    e = 7.5 degrees     so interior angle = 172.5 

Sum of interior angles of n-gon is  ( n-2)*180 

   each angle is then   (n-2)*180 / n    and this equals  172.5  degrees   solve for n 

         (n-2)*180 / n = 172.5 

           180n -360 = 172.5 n 

                n = 48 sides 

Maybe a bit simpler to realize exterior angles sum to 360 

                        n (7.5) = 360 

                             n = 48 sides 

a = v^2 / r        multiply both sides by 'r '

ar = v^2           divide both side by 'a'

r = v^2 /a 

87 kg *  1 pound / .45 kg =  ~ 193 pounds 

Back up !    Edited my answer    x = 3/2     y = 11/12   is the center       r^2 = 32.5 

Here is the graph ( does not look like posted question) :

Using   x,y  and 0,0 

d^2 = (x-0)^2  + (y-0)^2 

Using x,y and -2,1 

d^2 = (x- -2)^2 + (y-1)^2    

Equate these two d^2  s 

    x^2 + y^2  =  x^2 +4x +4     +  y^2 -2y +1   

               0 = 4x -2y + 5    

Now find the distance from x,y to -3,2 

    d^2 = (x- -3)^2  + (y-2)^2  

           =  x^2 + 6x +9  + y^2 -4y + 4         Equate this to the first (or second if you wish) d^2 equation 

        x^2 + y^2  = x^2 + 6x  + 9  + y^2 -4y + 4 

                0 =  6x -4y + 13 

Now solve the system of the two highligted equations 

4x-2y+5 =0 

6x-4y+13 = 0      Multiply the first equation by -2            

-8x +4y-10 = 0       Now add the two equations 

-2x + 3 = 0 

x = 3/2 

then y = 11/2                         (EDITED)