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## To find area of the circle

``````
Program:#include<stdio.h>
main()
{
float a,r;
printf("Enter the radius to find the area: ");
scanf("%f",&r);
a=3.14*r*r;
printf("%f",a);
}
```
```
Output:
```

Enter the radius to find the area: 5
78.500000
```
``````
Program:#include
#include
# define pi  3.14
main()
{
float r;
printf("Enter The radius of Circle :");
scanf("%f",&r);
printf("Area of the circle : %f
",pi*r*r);
}
```
```
Output:
```

Enter The radius of Circle : 2
Area of the circle : 12.56

```