# Calculate Area of ellipse

To calculate the area of ellipse you need to know the radius 1 and radius 2 of the ellipse.

Variables:

1. r1 : (Datatype int): to represent the radius 1 of the ellipse.

2. r2 : (Datatype int): to represent the radius 2 of the ellipse.

3. PI : (Datatype float): static variable to represent constant PI value up to 3 decimal places i.e 3.142

5. area_of_ellipse : (Datatype long): to store area of ellipse calculated.

Formula:

Volume of Ellipse : π x r1 x r2

``````/*
* 1000+ C programs + tutorials
*
*
* 11_calculate_area_of_ellipse.c
*
*
*  Created on: Oct 20, 2014
*  Author: Code2care.org
*/

#include <stdio.h>
//#include <conio.h>

void main() {

int r1,r2;
float PI = 3.142;
long area_of_ellipse;

//	clrscr();

printf(" Program to calculate Area of a Ellipse :  \n\n");

printf(" Enter Radius1 of Ellipse : ");
scanf("%d", &r1);

printf("\n\n Enter Radius2 of Ellipse : ");
scanf("%d", &r2);

area_of_ellipse = PI*r1*r2;

printf("\n\n Area of Ellipse with radius1 as %d and radius2 as %d = %ld",r1,r2,area_of_ellipse);

//	getch();

}``````
Output:
``````Program to calculate Area of an Ellipse :