I am pretty sure that the median is 80, correct me if I'm wrong :)
What problem is there to show work for?
A, dilation because the shape got larger. The other three options just move it around
Answer:

Step-by-step explanation:
The square is in the circle, so the diameter is the diagonal line of the square. This divides the square into two right triangles.
Two sides of the right triangle equal 8. This qualifies it as a special right triangle. This triangle has two sides that = x (in this case 8) and the hypotenuse is
.
Substitute 8 in for x.
is the diameter, so we divide in half to get the radius = 