difference()
{
	cylinder(10,10,10);
	translate([0,0,2])
	{	
		cylinder(11,9,9);
	}
}

//Triangle
scale(.3)
{
	rotate([0,90,0])
	{
		difference()
		{
	    		cube(10);
			translate([-3,10,0])
			{
				rotate([45,0,0])
				{
					cube(30);
				}
			}
		}
	}
}