A simple, step-by-step guide showing how to draw a regular hexagon, square and triangle, aimed at children between the ages of 11 and 14.

Trace around this template to make nine more equilateral triangles. Repeat with another 113cm line, but this time with 100cm of string to make an isosceles triangle -- you'll need 30 of them.

This is in the Portail Royale of Chartres Cathedral. One to the square root of three For this proportion, draw an equilateral triangle of any size. Draw a line from the centre of the base to the apex.