1. EQ: How do you find the circumference of a circle? Lesson 4-6 Circumference pp. 161-164 Vocabulary to watch out for this lesson: Circle Center Diameter Circumference Radius

2. A circle is the set of all points in a plane that are the same distance from a point called the center. EQ: How do you find the circumference of a circle?

3. The circumference of a circle is a little more than three times its diameter. The exact number of times is represented by the Greek letter pi – π –The real value of π is 3.1415926… It never actually ends. We use 3.14 as an approximation. So, π≈ 3.14. EQ: How do you find the circumference of a circle?

5. Example: Find the Circumference of a Circle EQ: How do you find the circumference of a circle?

6. Your Turn EQ: How do you find the circumference of a circle? a)Find the circumference of a circle whose diameter is 15 meters. Round to the nearest tenth.

7. Example: Use Circumference to Solve a Problem EQ: How do you find the circumference of a circle?

8. Your Turn: Find the circumference of each circle. Round to the nearest tenth. r = 23 in. r= 4.5 cm r = 6.5 ft EQ: How do you find the circumference of a circle?

9. Class work – p. 163 # 5-8 Homework – p. 163 # 9-21 all EQ: How do you find the circumference of a circle?