1. Mathematics
Circles
Grade

2. INTRODUCTION
Objective : To identify some concepts of the circle such as centre, chord, diameter and radius.
Target group : Secondary level, Grade- 6
Duration/Mode : 45 minutes/Student-centred.

3. CONTENTS
Circles
Diameter
Chord P
Concepts on Circle
Quiz Q

4. Circles
A circle is the set of all points in a plane that are at a given distance from a given point. The given point P is called the center of the circle and the given distance is called the radius of the circle. P
Radius
Center
Home

5. Diameter
A diameter is a line segment that connects two points on the circle and goes through the centre of the circle.
diameter P A B

6. Central Angle
A central angle is an angle whose vertex is the center of the circle.. A
Central
Angle P B

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

8. Sector A P B A sector is a region contained by two radii and an arc.

9. Chord
A chord of a circle is a segment whose end points lie on the circle.
chord C D

10. Concepts on circle Chord C Central Diameter Angle D P A B Sector Arc Q
Center
Radius

11. Quiz Choose the correct answer. 1. The longest chord of a circle is a
A. diameter
B. radius
C. segment

12. Quiz Choose the correct answer.
2. The distance between the center and a point on the circle is called
A. diameter
B. chord
C. radius

13. Quiz Choose the correct answer.
3. The part of a circle connecting two points of the circle is the
A. central angle
B. sector
C. arc

14. Worksheet Click on each icon to get the activity worksheet.
The following URL is the starting place, feel free to search the Internet for other related information.

15. C I R C L E S C I R C L E S
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