# Shell Script Calulate Area and Circumference of Circle

in Categories Shell Math last updated April 4, 2008

A circle is one of the simple shapes of Euclidean geometry. It is the locus of all points in a plane at a constant distance, called the radius, from a fixed point, called the center. Through any three points not on the same line, there passes one and only one circle.

A diameter is a chord passing through the center. The length of a diameter is twice the radius. A diameter is the largest chord in a circle.

Circles are simple closed curves which divide the plane into an interior and an exterior. The circumference of a circle is the perimeter of the circle, and the interior of the circle is called a disk.

## Sample Shell Script To Calculate Area and Circumference of Circle

```#!/bin/bash
# Shell script to calulate area and Circumference of circle.
# It take radius of a circle as input.
# -------------------------------------------------------------------------
# Copyright (c) 2005 nixCraft project <http://cyberciti.biz/fb/>
# -------------------------------------------------------------------------
# This script is part of nixCraft shell script collection (NSSC)
# ----------------------------------------------------------------------
# Lesson on Circumference of a Circle :
#  Visit http://www.mathgoodies.com/lessons/vol2/circumference.html
echo -n "Enter the radius of a circle : "

# use formula to get it
area=\$(echo "scale=2;3.14 * (\$r * \$r)" | bc)

# use formula to get it
d=\$(echo "scale=2;2 * \$r"|bc)
circumference=\$(echo "scale=2;3.14 * \$d"| bc)

echo "Area of circle is \$area"
echo "Circumference of circle is \$circumference"```

## 4 comment

1. nice and thank u
so much
ilearnt many and make
a power point for
cicumference

2. s there only one data structure in linux…? we cant get the floating point values, like \$ for int s ther any for decimal points…?

3. vishnu says:

thank for script