CirclesCirclesMathematicsMathematics

GradeGrade

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.

INTRODUCTIONINTRODUCTION

Q

P

CONTENTSCONTENTS

CirclesCircles

DiameterDiameter

ChordChord

Concepts on CircleConcepts on Circle

QuizQuiz

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.

PCente

r

Radius

CirclesCircles

A diameter is a line segment that

connects two points on the circle and

goes through the centre of the circle.

diameter

PA B

DiameterDiameter

A central angle is an angle whose vertex

is the center of the circle..

Central Angle

PB

Central AngleCentral Angle

A

An arc is part of a circle connecting two

points of the circle.

Arc

PB

ArcArc

A

A sector is a region contained by two

radii and an arc.

Sector

PB

SectorSector

A

A chord of a circle is a segment whose end points lie on the circle.

C

D

chord

ChordChord

A B

C

D

Q

Chord

Diameter

Center

Radius

P

Sector

Concepts on Concepts on circlecircle

Arc

CentralAngle

Choose the correct answer.

1. The longest chord of a circle is a

A. diameter

C. segment

B. radius

QuizQuiz

Choose the correct answer.

2. The distance between the center and a point on the circle is called

A. diameter

B. chord

C. radius

QuizQuiz

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

QuizQuiz

Click on each icon to get the activity worksheet.

http://www.math.com/school/subject3/lessons/S3U1L6GL.html

The following URL is the starting place, feel free to search the Internet for other related information.

WorksheetWorksheet

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