Question 918582
(-3,17) and 
(12,-26). Midpoint Pt(x,y):  ( {{{(x[1] + x[2])/2}}}, {{{(y[1] + y[2])/2  )}}}) = (9/2, -9/2)
{{{drawing(300,300,   -30,30,-30,30, 
 grid(1),
circle(-3,17,0.6),
circle(12,-26,0.6),
circle(4.5,-4.5,0.6),
line(-3,17,12,-26),
graph( 300, 300, -30,30,-30,30))}}}