VisualC++6.0

This is for a Calculate the area of a circle given the diameter.

Ok this is what I have so far;

#include<math.h>

voidmain(void)

{

pie,diameter,areais,sqrt(2);

cout<<"Enter Pie ";

cin>>Pie;

cout<< "Enter Diameter ";

cin>>diameter;

cout<< "Enter Area Is ";

cin>>areais;

cout<< "EnterSquare(2) ";

cin>>sqrt(2)

pie *4sqrt(2)/4

Do I have everything so far.