FIVE COINS IN CONTACT
‘Can you place four coins so that each coin touches the other three?’ asked Peter.
‘I certainly can,’ replied his uncle, ‘and if that isn’t enough,’ he continued, ‘I can place five coins so that they are all touching each other!’ Peter was silent, thinking.
Can you discover how to place four coins so that each touches each of the others, and discover a way of placing five coins under the same conditions?