Write a declaration for each of the following:

a. A line that extends from point (60, 100) to point (30, 90)

b. A rectangle that is 20 pixels wide, 100 pixels high, and has its upper-left corner at point (10, 10).

c. A circle that is centered at point (50, 75) and has a radius of 30.

d. An ellipse that is centered at point (150, 180) and is 100 pixels wide and 80 pixels high.