(a) Show that the surface area of a zone of a sphere that lies between two parallel planes is S 2Rh, where R is the radius of the sphere and h is the distance between the planes. (Notice that S depends only on the distance between the planes and not on their location, provided that both planes intersect the sphere.) (b) Show that the surface area of a zone of a cylinder with radius R and height h is the same as the surface area of the zone of a sphere in part (a).

Lipids 10/1/14 5:39 PM Triglycerides, Phospholipids, and Sterols o Poor health • Too much/too little fat • Too much of some kinds of fat o Family of Lipids • Triglycerides: fats and oils in food • Phospholipids: plant and animal origin • Sterols: cholesterol o Chemist’s view of fatty acids and triglycerides • Energy provided per gram o More carbons and hydrogens • Preview of lipids o Triglycerides: glycerol and 3 fatty acids o Fatty acids: even number of carbons, saturated/unsaturated o Omega-3 and omega-6 fatty acids • Fatty acids: key building blocks o O