This document defines and illustrates key terms related to circles such as radius, circumference, diameter, chord, arc, and sector. It explains that a circle consists of points equidistant from its center, and a radius is a segment from the circle to the center. The circumference is the distance around the entire circle. Congruent and concentric circles share the same center or radii. A chord connects two points on the circle, while the diameter passes through the center. An arc is part of the circle between two points, and a sector is the region between two radii and an arc.

2. • Circle
• Radius
• Circumference
• Congruent Circle
• Concentric Circle
• Chord
• Diameter
• Arc
• Sector

3. CIRCLE
A circle may be defined as the collection of
points which are at equal distance from a fixed point.
.c

4. RADIUS
A segment from a point on the circle to
the center of the circle.
Radius
C.

5. CIRCUMFERENCE
The circumference is the distance around
the circle.
circumference
C.

6. CONGRUET CIRCLE
Two circles whose radii have the same
measure.
C.C.

7. CONCENTRIC CIRCLE
Two or more circle that share the same
center.
.C

8. CHORD
A chord of a circle is a segment whose
endpoints lie on the circle.
A B
C
D
D
.O

9. DIAMETER
A chord passing through the center of a
circle.
A Q BC.

10. ARC
An arc is part of a circle connecting
two points of the circle.
A P
Arc
B Qc.

11. SECTOR
A sector is a region contained by two
radii and an arc.
A
Sector
B
CCC Q
C.

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