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Isometric Rhombuses

Age 11 to 14 Short Challenge Level:



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.
You can find more short problems, arranged by curriculum topic, in our short problems collection.