Page 210 - New Medley 4 Semester 1

� Now, rotate the pencil tip till you come back at the starting point.

� Thus, a circle is drawn.

� Here, point O is the centre of the circle.

Terms Related to a Circle

Centre: The fixed point from which every point on the circle

is equal called the centre of the circle. Here, O is the centre O
of this circle.

Radius: The distance of any point at the circle from its

A centre is called the radius of this circle. Here, OA is the
O
radius of this circle.

B
Diameter: The line segment that passes through the centre
O
and has end points on the circle is called the diameter of

the circle. Here, BC is the diameter of this circle.
C

Chord: The line segment joining any two points on the circle
Q
O is called the chord of the circle. Here, PQ is the chord of
this circle.
P
W

Arc: Any part of a circle is called an arc. An arc is represented

by symbol. Here, XZY is an arc of this circle. Other arc O

is XWY.
X Y
Z

Semi-circle: A diameter divides the circle into two halves.
M N
O Each half part is called a semi-circle.

208