dot = circle​(​50, "solid", "red"​)

background = rectangle​(​300, 200, "outline", "black"​)

Think of the background image as a sheet of graph paper with the origin (0,0) in the bottom left corner. The width of the rectangle is 300 and the height is 200. The numbers in put-image specify a point on that graph paper, where the center of the top image (in this case dot) should be placed.

Estimate: What coordinates for the dot created each of the following images?

A

White rectangle with a quarter of a red circle in the bottom left corner

B

White rectangle with a red semicircle in the center of the left edge

put-image(dot, , background)

put-image(dot, , background)

C

White rectangle with a quarter of a red circle in the top right corner

D

White rectangle with a red circle semi circle centered on the top edge

put-image(dot, , background)

put-image(dot, , background)

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