**C program for area of circle**

#include <stdio.h>

#define PI 3.141

int main(){

float r, a;

printf("Radius: ");

scanf("%f", &r);

a = PI * r * r;

printf("%f\n", a);

return 0;

}

**Mathematical formula for area of circle:**

Here
Pie is constant which is equal to

Pie = 22/7 or
3.14159265358979323846264338327950288419716939937510...

Radius
is radius of the circle.

7. Write a c program to find the area of rhombus.

8. Write a c program to find the area of parallelogram.

## 10 comments:

This program is easy to understand..

There are a few things wrong with this.

First, it's spelled "pi"

Second, 22/7 is not equal to "pi"

when the %f\n derived

why use %f\n instead of %f

\n is used to print after some space... aksh

some escape sequences unnecessary

\n for space

I planing to write algorithm part of my project work question is following

problem is finding intersection of between two ellipses

(x-x1)^2/a^2+(y-y1)^2/b^2=1,(x-x2)^2/c^2+(y-y2)^2/d^2=1 (x1,y1),(x2,y2) point of ellipse and a,b,c,d are major and minor axis of ellipses

please provide any idea of how to find out intersection of two ellipses

"/n" is used to print in new line

\n is used to going to next line

for example:printf("hello\n world");

output is:hello

world

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