What line does the equation x=7 represent

The measure of angle 0 is 600 degrees

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

Abicycle training wheel has a radius of 3 inches. the bicycle wheel has a radius of 10 inches.approximately how much smaller, in square inches and rounded to the nearest hundredth, is the area of the training wheel than the area of the regular wheel? *