Aspire Faculty ID #16403 · Topic: NIMCET 2010 · Just now
NIMCET 2010

A one rupee coin is placed on a plain paper. How many coins of the same size can be placed round it so that each one touches the central and adjacent coins?

Solution

Around a central circle, 6 equal circles can touch it and also touch their neighbours (classic circle packing in a plane).

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