Use this applet to view calculations of total surface areas of spheres and hemispheres.

Use this applet to view calculations of total surface areas of solid spheres and solid hemispheres.[br]Hemisphere is half the sphere.[br][br]1. What is the volume of the hemisphere compared to that of the sphere?[br][br]2. Why is the total surface area of a hemisphere 3/4 of the total surface area of the sphere and not 1/2 ?[br][br]3. What if the sphere is hollow? How is the hemisphere's total surface area different compared with the answer in 2?[br][br](Ask your teacher or classmates for the answers to Q3)