## 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 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 centimeter^{2} is equal to the pi of multiply the square of radius r^{2}_{(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 × r^{2}_{(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 × r^{2}

=3.14 ×25

=78.5 cm^{2}

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 × r^{2}

=3.14 ×20^{2}

=12.56 cm^{2}

Circumference of a circle

=2πr

=2×3.14×20

=125.6 cm