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Isometric Rhombuses

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



The diagram shows a grid of $16$ identical equilateral triangles.

How many rhombuses made up of two adjacent small triangles are there?










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.