How can i cancel this white line under, i dont need it


No white line is being drawn – the polygon is open, not closed.

Note how that figure only draws three straight lines, including no line along the bottom of the rectangular area.

If finallysolve in this way.
In what i need is draw the Top Left Right lines and fill it.
But seem like the bottom line will show what ever if i close it or not(btw if i close it, it’s there will be a black line under)