Chapter R4, Problem 87PE

To determine

(a) An expression for the area of region $A$ (Do not simplify).

(b) An expression for the area of region $B$.

(c) An expression for the area of region $C$.

(d) The addition of the areas of the regions $B$ and $C$.

(e) Show that the area of region $A$ is equal to the sum of areas of the regions $B$ and $C$. What property of real numbers does this illustrate?