Circle is perfectly round in shape. It has no sides and no diagonals. 'O' is the center of the circle. The distance from the center to each of these points A, B, C, D, E is the radius of the circle.

__Identifying
center, radius and diameter of a circle__

Circle is perfectly round in
shape. It has **no sides** and **no diagonals.
'O'** is the center of the circle. The distance from the center to
each of these points A, B, C, D, E is the **radius** of the circle.

Radius is equal in length
(OA=OB=OC=OD=OE).

**All the radii are equal in length
in a circle.**

A Line segment AB passes through
the center of the circle O. AB is the diameter of the circle. The line segments
XY and LM are the **Chords** (XY, LM, AB).

The longest chord of a circle is
the **diameter** (AB). The radius is
always half of the diameter.

**Diameter is the longest chord.**

__EXAMPLE__

1. Find the diameter of a circle
whose radius is 5 cm.

Diameter = 2 x radius

= 2 x 5

Diameter = 10 cm

Diameter = 2 × radius

Radius = Diameter / 2

2. Find the radius of a circle
whose diameter is 88cm.

Radius = diameter / 2 = 88 / 2

Radius = 44 cm

__Activity__

Measure the radius and diameter
of the following circles.

Tags : Geometry | Term 1 Chapter 1 | 4th Maths , 4th Maths : Term 1 Unit 1 : Geometry

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4th Maths : Term 1 Unit 1 : Geometry : Identifying center, radius and diameter of a circle | Geometry | Term 1 Chapter 1 | 4th Maths

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