- Enter the values of Either Radius,Diameter,Area or Circumference

- Click on the calculate button to get the value of empty

if r is radius of the Circle,then

$\text {Diameter} = 2r$

$\text {Area of Circle}= \pi r^2$

$\text{circumference}= 2 \pi r$

Circle is a two dimensional geometricial shape.It is defined mathematically as the set of points that are all at the same distance r from a given point in a two dimensional space..

The distance r is called the Radius of the Circle.

Diameter of the Circle is two times radius of the Circle

$D= 2r$

Area of Circle is given by the formula

$\text{Area}= \pi r^2$

Circumference of circle is given by

$\text{circumference}= 2 \pi r$

Find the Area and Circumference of a Circle whose radius is

i. 3 cm

ii. 10 cm

(i) r=3 cm, A=? Area of Circle is given by the formula

$A= \pi r^2= 3.14 \times 3^2 =28.26 \ cm^2$

Circumference of circle is given by

$C= 2 \pi r =2 \times 3.14 \times 3 =18.84 \ cm$

(i) r=10 cm, A=? Area of Circle is given by the formula

$A= \pi r^2= 3.14 \times 10^2 =314 \ cm^2$

Circumference of circle is given by

$C= 2 \pi r =2 \times 3.14 \times 10 =62.8 \ cm$

Find the radius,Diameter and Circumference of the circle whose Area is 628 cm

A=628 cm

$A= \pi r^2$

Rearranging for radius

$r= \sqrt { \frac {A}{\pi}} = \sqrt { \frac {628}{3.14}}= 14.14 \ cm$

Now

Circumference of circle is given by

$C= 2 \pi r =2 \times 3.14 \times 14.14 =88.81 \ cm$

Diameter is given by

D= 2r = 28.18 cm

Find the radius,Diameter and Area of the circle whose Circumference is 12.56 cm

A=?, D=? ,r=?, C=12.56 cm

Circumference of circle is given by

$C= 2 \pi r$

Rearranging for radius

$r= \frac {C}{2 \pi} = \frac {12.56}{2 \times 3.14} =2 \ cm$ Area of Circle is given by the formula

$A= \pi r^2 = 3.14 \times 2^=12.56 \ cm^2$

Diameter is given by

D= 2r = 4 cm

- if r is radius of the Circle,then calculation done as below formula

$\text {Diameter} = 2r$

$\text {Area}=\pi r^2$

$\text{circumference}= 2 \pi r$

- if Area of the Circle is given,then calculation done as below formula

$\text {radius} = \sqrt { \frac {A}{\pi}}$

$\text {Diameter}=2r$

$\text{circumference}= 2 \pi r$

- if circumference of the Circle is given,then calculation done as below formula

$\text {radius} = \frac {C}{2\pi}$

$\text {Diameter}=2r$

$\text {Area}=\pi r^2$

- if Diameter of the Circle is given,then calculation done as below formula

$\text {radius} = \frac {D}{2}$

$\text{circumference}= 2 \pi r$

$\text {Area}=\pi r^2$

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