1. 11.3 Sector Area and Arc Length (Part 1)
Geometry

2. Reminder: Circumference
Circumference is the distance around a circle (Perimeter)
C=2лr or C=лd

3. Reminder: Measuring An Angle
We measure an arc in degrees
We can find the length of an arc in linear units as well (meters, feet, inches, etc.)
Arc Length Formula
arc length 2𝜋𝑟 = 𝑛 360

4. Note: mAB = the degree measure of the arc
Length of AB= how long it is in cm, in, ft., etc.

5. Examples

6. 11.3 Sector Area and Arc Length (Part 2)
Geometry

7. Reminder: Area
Area of a circle
A = 𝜋 𝑟 2

8. Sector of a Circle
Sector – region bounded by two radii and their intercepted arc
Piece of pizza

9. Area of A Sector
To find the area of a sector of a circle (area of a piece of pizza)
area of sector 𝜋 𝑟 2 = 𝑛 360

10. Examples