## What is circle?

Introduction of Circle & Area & Circumference | CIRCLE is a closed shape figure which has some constant distance from the from any fixed point, which is known as the Centre of Circle. The distance between center to any point of a circumference of a circle is known as Radius and the twice of the radius is known as the diameter of that circle. Circumference of a circle is known as the distance around the circle. Here, you will know detailed knowledge of Area & Circumference of circle. ### What is pie (π)?

Pie is the number you get when you divide the circumference by the diameter. The value of pie we will get it will be 3.141592654. ### Circumference Of Circle

Circumference is the distance around the circle.

Circumference = 2πr or 2d

where
“r” is the radius of a circle.
“d” is the diameter of a circle.

Example: Find the circumference whose radius is 4 c.m
Solution:
r = 4 c.m
Circumference = 2πr
= 2 x 3.14 x 4
Circumference is 25.12 c.m

### Area of Circle

Area = πr2

Area of a circle by diameter
Area = πr2
=π x (d2)2
Area = πd24 Example: –

Find the Area of Circles which has radius 2 cm, 10 m, 23 mm and 78 cm. Find the area of a circle with the help of diameter.  ### Tangent

Tangent is the line which touches the outer part of the circle.

### Secant

A line which cuts the circle from their opposite point known as Secant.

### Chord

The chord is the line, whose points lie on the circumference of a circle. We can understand chord, secant, tangent, diameter & radius, all in one frame just by seeing the image given below

I hope this, the article will help you to understand the concept of Introduction of Circle | Area | Circumference. If you have any question related to the article, you can post it into the comment section. You will get a reply shortly.

I hope you have learned it properly.