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Doubly Symmetric

Stage: 3 Short Challenge Level: Challenge Level:1
See all short problems arranged by curriculum topic in the short problems collection




What is the smallest number of additional squares that must be shaded so that this figure has at least one line of symmetry and rotational symmetry of order $2$?













If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.

This problem is taken from the UKMT Mathematical Challenges.