1. The area of the circle is about 227 m 2. COURSE 2 LESSON 8-4 Find the area of the circle to the nearest unit. = (8.5) 2 Substitute 8.5 for the radius. A = r 2 Use the formula for the area of a circle. = 226.9798775 Use a calculator. 227Round the solution to the nearest unit. 8-4 Circumferences and Areas of Circles

2. The area of the pizza is approximately 615.8 cm 2. COURSE 2 LESSON 8-4 A pizza has a diameter of 28 cm. What is the area of the pizza? Round to the nearest tenth. = 615.75164 Use a calculator. 615.8Round the solution to the nearest tenth. = (14) 2 Substitute 14 for the radius. A = r 2 Use the formula for the area of a circle. r = = 14The radius is half the diameter. 28 2 8-4 Circumferences and Areas of Circles

3. Use 3.14 for. Find the area and the circumference of each circle to the nearest tenth. 1.r = 10 m2.d = 14 ft COURSE 2 LESSON 8-4 A = 314 m 2 ; C = 62.8 m A = 153.9 ft 2 ; C = 44.0 ft 8-4 Circumferences and Areas of Circles