class Triangle
{
double base;
double height;
Triangle(double b, double h)
{
base=b;
height=h;
}
double area( )
{
return (0.5*base*height);
}
}
class triangle 1
{
public static void main (String args[ ])
{
double area1;
Triangle t1=new Triangle(10,20);
Triangle t2=new Triangle(10,30);

area1=t1.area( );
System.out.println(“Area of t1=”+area1);
area1=t2.area( );
System.out.println(“Area of t2=”+area1);
}
}