The Circle By Ranjana O A CIRCLE Eg

The Circle By Ranjana

O A CIRCLE Eg. ball, bangle, lemon. coin

CENTRE B CENTRE : O RADIUS : OA O RADIUS A

. O In a plane, each point of the circle is at equal distance from a fixed point. The fixed point is called the centre of the circle. CENTRE = O

O Radius A The distance from centre to any point on the circle is called radius of the circle. RADIUS = OA

A DI A M O E T ER . B A Line segment passing through the centre of the circle and whose end points lie on the circle is called the diameter of the circle. DIAMETER = AB

. O The length of the circle or the distance around it is called circumference of the circle.

A . O B A Line segment whose both the ends touches the circumference and passes through the centre is called diameter. DIAMETER : AB

Relation between radius and diameter RADIUS = DIAMETER 2 A OB = AB 2 . O B

Eg. If diameter of the circle is 10 cm then find its radius? Sol. Radius =diameter / 2 radius=10 cm/ 2 radius =5 cm A . O Diameter = 10 cm B

Eg. If radius of the circle is 6 cm, then find the diameter of the circle? Sol. Diameter = 2 x Radius Diameter = 2 x 6 cm Diameter = 12 cm Radius = A 6 cm . O

RELATION BETWEEN CIRCUMFERENCE AND DIAMETER CIRCUMFERENCE = 3 x DIAMETER(APPROX) A . O DIAMETER B

Eg. Find the circumference (approx) of the circle whose diameter is 10 cm. Sol. Circumference = 3 x diameter(approx) Circumference = 3 x 10 cm Circumference = 30 cm A . O DIAMETER=10 CM B

EVALUATION 1. what is the relation between radius and diameter of the circle? Sol. Radius=diameter/2 2. What is the relation between circumference and diameter of the circle? Sol. Circumference=3 Xdiameter(approx) 3. In this figure radius OA or OB is ______. diameter AB is ____. centre O is _____. A . O B

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