1. Circumference
TeacherTwins©2104

2. Warm Up 1).Draw a picture to show what the following terms mean.
Radius Diameter Circumference
2). What is the relationship between the circumference and the diameter?

3. Flippable

4. Circumference

5. Example 1: Find the circumference.
13 in
3.14 x 13 = in

6. 3.14 x 11 = 34.54 cm Example 2: Find the circumference.
Radius is 5.5 cm so the
Diameter is 11 cm
5.5 cm
3.14 x 11 = cm

7. Practice Find the circumference of each circle.
1).
2).
3).
4).
5 in
31.4 in
15 in
47.1 in
12 in
75.36 in
23 in
72.22 in

8. Closure Solve the following problem.
The circumference of Jon’s bike wheel is 7.85 feet. What is the diameter of his wheel?
2.5 ft.