How to cut a watermelon into triangles?

Rounds: Slice the watermelon crosswise into 1-inch rounds. Topped with fruit and yogurt, these make the most photo-ready watermelon pizzas. Plain rounds can be cut into triangles with the rind attached for easy eating, or the flesh can be cut out into shapes. read more

This one is a seedless watermelon, with a very few little tiny seeds in it. To cut it into triangles, for safety I'm going to turn this half over with the flat side down, so now it won't roll around, and I'm going to cut it in half again. Now I've got two beautiful triangles - and again, for safety, leave it flat this way. read more