1. 10.1 Circles and Circumference
By the end of class you will be able to identify parts of circles and calculate circumference.

2. Circle Vocabulary
Circle: The locus of all points in a plane equidistant from a given point, known as the center point.
Radius: A segment that has one endpoint on the circle, and the other endpoint the centerpoint.
Chord: A segment whose endpoints are on the circle.

3. Circle Vocabulary
Diameter: A chord that passes through the center of the circle
Concentric Circles: Circles with the same centerpoint
Inscribed/Circumscribed:

4. The diameters of circles X, Y and Z are 22, 16 and 10 respectively
The diameters of circles X, Y and Z are 22, 16 and 10 respectively. Find EZ and XF

5. Circumference
A circle’s “perimeter”
Formula:

6. Circumference Problems
Find the circumference of a circle (in terms of pi) with a radius of 13in.
Find the circumference of a circle (to the nearest hundredth) with a diameter of 6mm.
Find the diameter and radius of a circle that has a circumference of 65.4ft.

7. Circumference Problems
Find the exact circumference of the circle.

8. Circumference Problems
A bike tire has a radius of 24in. How far (in feet) will the bike tire travel in 1000 revolutions.