STEP 1: Using a pencil and ruler, draw a horizontal line. Set the compass to the width of the line. ... you now have a regular equilateral triangle. Image caption, You’ve done it!

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.

Put the compass at the midpoint of one side of the square and the pencil on an opposing corner. ... draw an equilateral triangle of any size. Draw a line from the centre of the base to the apex.