Video duration: 543 seconds
Global video hits: 6333
GCSE Maths lesson on applying Pythagoras' result about right angled triangles to problems. Finding longest side, finding shortest side, testing a triangle for right angle, mixed problems.
Video duration: 229 seconds
Global video hits: 26411
After watching http://www.youtube.c om/watch?v=0XyWWQaW- ZU, made by Japanese people, we decided to try to make one ourselves, and to include a "making of".
Video duration: 598 seconds
Global video hits: 4666
We show how the basic notion of rational trigonometry---quadr ance---arises from the geometry of the ancient Greeks. The little-known sister theorem to Pythagoras features prominently, and is closely related to a theorem of Archimedes.