# include //Function prototype ____________ int menu 1 (); float const pi = 3.144; int main(){ int a;//calling function menu _______ if(a == 1) printf("%f", function1(5)); else display(6.10); return 0; } int menu1(){ int choice;;; return (choice); } ________ function 1(_________) { return (pi*radius*radius); } void display(_________) { printf("The area of triangle is %f ", 0.5*h*w); } Fill in the blank with suitable