C program for radius of circle, C/C++ Programming

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C Program for RADIUS OF CIRCLE

#define PI 3.14159

main()

{

float r,a;

clrscr();

printf("ENTER THE RADIUS OF A CIRCLE: ");

scanf("%f",&r);

a=PI*r*r;

printf("\NTHE AREA OF A CIRCLE IS %f",a);

getch();

}

OUTPUT :

ENTER THE RADIUS OF A CIRCLE: 5

THE AREA OF A CIRCLE IS 78.539743

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