You may also like

Coke Machine

The coke machine in college takes 50 pence pieces. It also takes a certain foreign coin of traditional design...

At a Glance

The area of a regular pentagon looks about twice as a big as the pentangle star drawn within it. Is it?

Cosines Rule

Three points A, B and C lie in this order on a line, and P is any point in the plane. Use the Cosine Rule to prove the following statement.

Figure of Eight

Age 14 to 16
Challenge Level

Identify why the yellow and green triangles are similar and then try to work out the line ratio.
You'll need to think about the angles made to the centre of the pegboard.
How is the area ratio connected to the line ratio?