Area of circle

 //we include header file math for maths tools

// M_PI maths pi

// area of circle is pi radius square


#include <stdio.h>

#include <math.h>


int main (){

    float radius, area;

printf("enter the radius of circle\n");

scanf("%f" , & radius);

area = M_PI * radius *radius ;

printf("area of circle is %f " , area);

return 0 ;

}

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