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Circle Calculator
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Circle Calculator is an online tool used to find the diameter, area and circumference of a circle.

Circle is defined as the set of points that is at an equal distant from the centre of the circle. The circle can drawn by a complete revolution of 360° from a single point called the centre without changing the radius. 
Circle
The units of length that will not affect the calculations. The unit remains same for diameter and circumference of a circle, only it defer for area of a circle (i.e. from unit to unit square). Any other base unit can be substituted.
 

Step by Step Calculation

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Step 1 :  

Circle Formula's


 


Diameter of a Circle


 


d = 2r


 


Where d = diameter and r = radius


 


Area of a Circle


 


A = $\pi$r2


 


Where A = area, r = radius and $\pi$ value = 3.142


 


Circumference of a Circle


 


C = 2$\pi$r


 


Where C = circumference, r = radius and $\pi$ value = 3.142



Step 2 :  

Put the values in the above formula's and solve it further.



Example Problems

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  1. The radius of a circle is 6 cm. Figure the diameter, area and circumference of that circle?


    Step 1 :  

    Given: r = 6 cm


     


    Diameter of a Circle


     


    d = 2r


     


    Where d = diameter and r = radius


     


    Area of a Circle


     


    A = $\pi$r2


     


    Where A = area, r = radius and $\pi$ value = 3.142


     


    Circumference of a Circle


     


    C = 2$\pi$r


     


    Where C = circumference, r = radius and $\pi$ value = 3.142



    Step 2 :  

    Put the values in the above formula's and solve it further.


     


    Diameter of a Circle


     


    d = 2 * 6


     


    = 12 cm


     


    Area of a Circle


     


    A = $\pi$62


     


    A = 3.142 * 36 cm2


     


    A = 113.09 cm2


     


    Circumference of a Circle


     


    C = 2$\pi$6


     


    C = 2 * 3.142 * 6


     


    C = 37.69 cm



    Answer  :  

    Diameter of the Circle = 12 cm

     

    Area of Circle = 113.09 cm2

     

    Circumference of a Circle = 37.69 cm



  2. The radius of a circle is 11 cm. Figure the diameter, area and circumference of that circle?


    Step 1 :  

    Given: r = 11 cm


     


    Diameter of a Circle


     


    d = 2r


     


    Where d = diameter and r = radius


     


    Area of a Circle


     


    A = $\pi$r2


     


    Where A = area, r = radius and $\pi$ value = 3.142


     


    Circumference of a Circle


     


    C = 2$\pi$r


     


    Where C = circumference, r = radius and $\pi$ value = 3.142



    Step 2 :  

    Put the values in the above formula's and solve it further.


     


    Diameter of a Circle


     


    d = 2 * 11


     


    = 22 cm


     


    Area of a Circle


     


    A = $\pi$112


     


    A = 3.142 * 121 cm2


     


    A = 380.13 cm2


     


    Circumference of a Circle


     


    C = 2$\pi$11


     


    C = 2 * 3.142 * 11


     


    C = 69.11 cm



    Answer  :  

    Diameter of the Circle = 22 cm

     

    Area of Circle = 380.13 cm2

     

    Circumference of a Circle = 69.11 cm



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