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Prof Smudge says:

This relates to Leonardo's proof of Pythagoras' Theorem.

Give it an hour or two. If you don't get any where, try this more salient version.

Send your solution/comments to
info@mathsmed.co.uk

FREE:
a high-res pdf file of this GEO task

52p:
a high-res pdf file of ALL GEO A–Z tasks

MATHEMATICS TEACHING readers:
The link given in MT 231 can be found here