Ever notice how rose petals curl at the edges with those elegant pointed tips? For centuries, artists have celebrated these ...

The shape is based on how much moisture is present ... Also read: More winter storms likely in Maine this week Thin plates ...

Save guides, add subjects and pick up where you left off with your BBC account. Two-dimensional (2D) shapes are completely flat. They cannot be picked up. 2D shapes can be found printed in a book ...