Circle Calculator, Formula and Sample Example

Circle Calculator :

Enter the circle calculator, calculates the Radius (r) in centimeters(cm), Diameter (d) in centimeters(cm) , Circumference (c) in centimeters(cm) , Area (A) in square centimeters (cm²), and you get the circle calculation below the calculator.

Circle Calc: find c, d, a, r

Circle Formula :

Circle formula is diameter of circle D(cm) in centimeter is equal to two multiply the radius r(cm) in centimeter and circumference of circle c(cm) in centi meter is equal to  two multiply pi multiply the radius r(cm) in centimeter and Area of circle A(cm2) in centimeter2 is equal to the pi of multiply the  square of radius r2(cm) in centimeter. Hence the circle formula can be written as,

Diameter of circle  D(cm)=2× r(cm)

Circumference of circle c(cm)=2×π × r(cm)

Area of circle A(cm2)= π × r2(cm)

Sample Examples  :

Example1 :

Calculate its diameter, area and circumference? In a circle has radius 5 cm.

Solution :

Given parameters are

Radius r=5cm

Diameter of a circle is given by=2× r

=2×5

=10cm

Area of a  circle is given by

= π × r2

=3.14 ×25

=78.5 cm2

Circumference of a circle is given by

=2πr

=2×3.14×5

=31.4 cm

Example 2:

Calculate the diameter, area and circumference of a circle of radius 20cm ?

Solution :

Given parameters are

Radius of a circle r=20cm

Diameter of a circle is given by

=2×r

=2×20

=40cm

Area of a circle is given by

= π × r2

=3.14 ×202

=12.56 cm2

Circumference of a circle

=2πr

=2×3.14×20

=125.6 cm

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