1. Identifying parts of the circle
Circles
Identifying parts of the circle

2. Vocabulary
Radius
Chord
Diameter
Arc
Center

3. Center and Arc B C — A
A circle can be named by its center. A circle with a center labeled C would be named circle C. An unbroken part of a circle is called an arc.

4. Radius A radius connects the center with a point on the circle.
radius CD D C —

5. A chord connects two points on a circle. chord AB— B — A

6. diameter
A diameter is a chord that passes through the center of a circle.
diameter AB A — — B

7. Lesson Quiz Use the given diagram for the following:
1. Name two radii.
2. Name two chords.
3. Name the center of the circle.
4. Name a diameter.
5. Name an arc of the circle. H A — G J E D F C B K