2. Lesson 8.7 Concept: How to find the circumference of a circle. Guidelines: *The diameter of a circle extends from one side of the circle to the other through the center point. It is twice the radius. Formula: Circumference = pi diameter C = π d * pi ( π) is the number of times the diameter stretches around the circle, 3.14 1 2 3 0.14 * Circumference is the distance around the perimeter of a circle.

3. Formula: Circumference = pi diameter C = π d or C = π d Match the circumference to the diameter. 1.103.62 a. 4 2.97.34 b. 27 3.12.56 c. 31 4.84.78 d. 6 5.18.84 e. 33

4. Formula: Circumference = pi diameter C = π d or C = π d or C = 2π r Match the circumference to the radius. 1.6.28 a. 2 2.37.68 b. 3 3.12.56 c. 5 4.31.14 d. 1 5.18.84 e. 6

5. Find the missing measures: C = π d or C = 2π r d =1.5’ r = 2.2 C = 23.8 C = 4.71 C = 13.816 d = 7.58 d