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'Egyptian Rope' printed from http://nrich.maths.org/
The ancient Egyptians were said to make right-angled triangles
using a rope which was knotted to make $12$ equal sections.
If you have a rope knotted like this, what other triangles can you
make? (You must have a knot at each corner.)
What regular shapes can you make -
that is, shapes with equal sides and equal angles?