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Friday, 8 February 2013

Real Life Maths: Circle Theorems and Ship Navigation

Eureka! I have just found a truly shiny thing. A prized possession in my magpie collection of shiny resources.

A video that explains why CIRCLE THEOREMS are useful.

Hooray! I love circle theorems. I love the way you have to visualise shapes inside a complex diagram, but once you've seen the visual links, the actual calculations are not hard at all. They make for lots of lovely "ohhhh, I get it" moments.

The only problem I have with teaching circle theorems is that I can never think of a practical use for them. But I've just found one: Calculating the distance of the visible horizon.

Here is the link:

Its particularly good because the nice young man in the video explains why maths is so important to his job first, then gives you a lovely clear example of how to use the circle theorem that the angle between the tangent and a radius is 90 degrees.

The only problem is that I just taught that topic to y11 today. I wish I'd found it yesterday!


1 comment:

  1. Bridge Navigational Watch & Alarm System – BNWAS is a monitoring and Alarm system which notify other navigational officers or master of the ship if the officer on watch (OOW) does not responds or he/she is incapable of performing the watch duties efficiently which can lead to maritime accidents.