Bourke High School - Area of an Annulus
- David McBain,
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. Use the applet to answer the following questions: 1. What is the formula for the area of an annulus? 2. By varying the radii, what is the smallest and largest area of the applet's annulus?