By forming a proportional relationship with the marked point, what we are saying is that the same dilation if applied to each coordinates of the marked point will form the new point
The marked point is given as (-20,40)
If we dilate this by -0.75 units
That will give (15, -30)
So this forms a proportional relationship with the marked point
The two points are 6 places apart, so that can be 6 units as radius. To find the circumference of a circle you do r x 3.14 (to abbreviate pi). 6 x 3.14 is 18.84 so A is your answer.
