This document discusses formulas and examples for calculating the areas of circles, sectors, segments, and annuli. It introduces the formula for calculating the area of a circle as πr^2. It then provides examples of using this formula, as well as the formula for calculating the area of a sector, which is (portion of the circle) x (area of the circle). The document concludes by assigning homework problems from page 758 numbers 3 through 31 odds.