Praxis the robot and Alan the "human man" attempt to land a plane using their knowledge of trigonometry. Luckily, the plane is full of ancient mathematicians who fill in some history of the development of trig.

First broadcast:
10 May 2012

Explore the relationship between angles and ratios. Discuss with students the real world uses of these calculations – such as planning the angle of a plane's flighta and using sundials to work out the position of the sun.