Question 11
An uses small equilateral triangular cards of side 1 cm to make the first sequence. Bình uses small square cards of side 1 cm to make the second sequence. The first four figures in each sequence contain 1, 4, 9 and 16 cards, as shown. Each child chooses one figure from their own sequence. The sum of the two perimeters is 50 cm. What is the greatest possible number of cards in An’s figure?
