1. Circles and terms related to them

2. Pi Video
view=detail&mid=9D4A34A7367BD69C4A779D4A34A7367BD69C4A77& FORM=VRDGAR

3. Circle
A set of points equal in distance from a given point, called the center.

4. Radius
A line segment connecting the center of the circle to a point on the circle.

5. Diameter
A line segment which goes through the center of the circle and connects two points on the circle.

6. Chord A line segment which connects two points on a circle.
Can a diameter be considered a chord?

7. Central angle
An angle whose vertex is the center of a circle

8. Arc
Piece of a circle

9. Formula for circumference
C = 𝜋𝑑 or C = 2𝜋r
So if r = 3 in.

10. Formula for area of a circle
So if r = 3 in