1. Table of Contents 32. Circumference & Arc Length

2. Circumference & Arc Length
Std. – MM2G3 – Understand properties of circles
EQ – How are circumference and arc length related?

3. Circumference
the distance around a circle.
C = 2r

4. Ex: Find the circumference of a circle with a diameter of 12 cm.
C = 2r
C = 2(6)
C = 12
C = cm
* If asked to leave your answer in terms of , the result would look like this. cm

5. Ex: Find the radius of a circle with a circumference of 52 in.
C = 2r
52 = 2r
52/2 = r
8.28 in.  r

6. Arc Length The measure of an arc is in degrees.
The length of an arc is in linear units. (such as ft, cm, etc.)
To find the length of AB is: ( ( (

7. Ex: Find the length of JK.( ( C
60o
16 in. J K

8. Ex: Find the m LM. ( (
16.76 in. (
L M
8 in. C (

9. Ex: Find the circumference of circle C.( R
10.2 cm S
45o C

10. Assignment
Pg. 226: #2-10 even