St. Thomas Training college

Submitted by,Priya P NairReg no:18014386006Mathematics OptionalYear:2015-2016

WELCOME

INTRODUCTION TO CIRCLES

Circle is the locus of points equidistant from a given point, the center of the circle.

Circle

Distance around a circle is called circumference.

C =2πr

CIRCUMFERENCE

DIAMETER OF the CIRCLEA line segment joining any two points

on the circle and that passes through its centre is called a diameter.

d= 2r, where r is radius of the circle

Radius of the circleThe radius of a circle is the distance

from the center of a circle to any point on the circle.

Infinite number of radii can be drawn in a circle

CHORD OF THe CIRCLEA line segment joining any two points

on the circle is called a chord.Diameter is also a chord of the circle.Diameter is the longest chord of the

circle.

ARC OF THE CIRCLEAn arc is the distance between any two

point on the circumference of a circle.

SEMICIRCLE OF A CIRCLEA semicircle is a half circle, formed by cutting

a whole circle along a diameter lineAny diameter of a circle cuts it into two equal

semicircles.e circle.

AREA OF A CIRCLE

The area of a circle is π times the square of the radius

A = r2

Points to discussCircle featuresDiameter and radiusChordArcArea of the circle

THANK YOU