Learn how to find the angles in right-angled triangles with this BBC Bitesize Maths article. For students between the ages of 11 and 14.

Yet despite these handicaps, OpenOffice.org's diagram tools work well enough that many users should find no need for more sophisticated tools such as Dia. Diagrams require a degree of precision in ...

However, there’s been limited options for creating wiring diagrams. Often these are created in Microsoft’s Visio, which is neither open source nor well suited for the task.