The document defines key terms related to circles such as radius, circumference, chord, diameter, arc, and sector. It explains that a circle is a collection of points equidistant from a fixed center point and defines the radius as the segment from the center to the edge. The circumference is the distance around the entire circle. Two circles are congruent if their radii are the same measure and concentric if they share the same center. A chord connects two edge points, a diameter passes through the center, and an arc is part of the edge between two points. A sector is the region between two radii and their connecting arc.

2. TOPIC : CIRCLES
DEVIKA HARIDAS
B.Ed Mathematics
Mangalam College of
Education

3. CIRCLES
• Sector
• Circle
• Radius
• Circumference
• Congruent Circle
• Concentric Circle
• Chord
• Diameter
• Arc

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

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

6. CIRCUMFERENCE
The circumference is the distance
around the circle.
C.
Circumference

7. CONGRUENT CIRCLE
C. C.
Two circles whose radii have the same
measure.

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

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

10. DIAMETER
A chord passing through the
center of a circle .
C.B Q

11. ARC
An arc is part of a circle connecting two points
of the circle.
c.
ARCA
B

12. SECTOR
A sector is a region contained by two radii
and an arc.
C.
SECTOR
A
B