Save guides, add subjects and pick up where you left off with your BBC account. Two-dimensional (2D) shapes are completely flat. They have two dimensions – length and width. A polygon is a ...

Did you notice how sometimes the supports form different geometric shapes such as triangles or squares? In this project you will be a structural engineer and make your own "support" shapes out of ...

Four points define four different triangles. Ten points define 120 triangles ... It’s closely related to problems about intersecting shapes, which in turn connect to both number theory and Fourier ...