<?PHP

abstract class  T0 
	{ 
		var  $a=0;
		var  $b=0;
		var  $c=0
		var  $base=0;  

//We build the object TO

function T0 ($a, $b, $c) 
	{
		$this->a = $a;
		$this->b = $b;
		$this->c = $c;
	}
			
function addition(T0 triangle1,T0 triangle2)
	{
		triangle1.a=triangle1.a+triangle2.a;
		triangle1.b=triangle1.b+triangle2.b;
		triangle1.c=triangle1.c+triangle2.c; 
		return triangle1;
	}
	
function substraction(T0 triangle1,T0 triangle2)
  	{
		triangle1.a=triangle1.a-triangle2.a;
		triangle1.b=triangle1.b-triangle2.b;
		triangle1.c=triangle1.c-triangle2.c; 
		return triangle1;
	}
      
function area(T0 triangle)
	{
		base=triangle.a;
		if (triangle.b>triangle.a) {
		base=triangle.b;
	}
		if (triangle.c>triangle.a) {
		base=triangle.c;
	}
		if (triangle.a==triangle.b) {
		base=triangle.c;
	}
		if (triangle.a==triangle.c) {
		base=triangle.b;
	}
		return base*1/2;    		                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         }                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
		
function result(T0 triangle)
	{
		echo "The first side is: \n";
		echo $this->a . "
		echo "The second side is: \n";
		echo $this->b . "
		echo "The third side is: \n";
		echo $this->c . "
	}                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
}
?>