The work is done, but what two assumptions can be made?

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees. 

i don't understand. explain it clearly

im srry but ur wrong the answer is d a smooth rock, some red dirt, and an empty bird's nest.