How do you connect nine dots 3x3 square with four lines?

Answer 1

Start at the bottom left dot, go up to the top left dot but carry on as though there is another invisible dot above it, then go diagonal right to the top middle dot and carry on to the middle right dot and carry on again as if there is another invisible dot to the right of the bottom row of dots, then go left to the bottom left dot, then go diagonal right to the top right dot.