This applet calculates the area of an annulus, having a larger radius R and a smaller radius r. The two radii can be varied by moving the black dots where the labels 'Outer' and 'Inner' are shown.[br][br]Use the applet to answer the following questions:[br][br]1. What is the formula for the area of an annulus?[br]2. By varying the radii, what is the smallest and largest area of the applet's annulus?