How do you draw the sacred crest in the ocean king temple?

To draw the Triforce in the temple of the ocean king you have to use your stylus and without removing the stylus from the screen you have to draw the triforce. Also you have to draw it without going back over your lines. So draw the outside triangle by starting in the middle of the bottom line. Then when you reconnect to the outside line draw the upside down triangle inside the bigger triangle.