5.1 The diagram shows an irregular hexagon with interior angles all equal to 120° made by cutting the corners off a piece of card in the shape of an equilateral triangle with sides of length 20 units. An identical hexagon could also be made by cutting the corners off a different equilateral triangle: what is the side length of this triangle? 23 25 27 13 29 3 10 11 6 31

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