I need to know how to obtain co-ordinate input for a program that uses Heron's theorem (Area=sqrt(s(s-a)(s-b)(s-c)) where s=1/2 perimeter and a,b,c are the lengths of the sides. I'm at a loss for where and how to store these co-ordinates once the user inputs them. If someone could give me a clue I'd be much obliged.