a write a procedure called area-of-rectangle h w

Question

(a) Write a procedure called (area-of-rectangle h w) that computes the area of a rectangle of height h and width w.

(b) Write a procedure called (area-of-circle r) that computes the area of a circle of radius r.

(c) Write a procedure called (distance x y) that computes that distance between 2 points, x and y, in a plane.