Patrick numbers certain squares on a sheet of grid paper. Each square has a ... side-length of 0.5cm. He starts by putting 1 in one of the squares and then 5 4 3 numbers 2,3,4,5,... in squares in an anti-clockwise direction, as shown. He 6 1 2 stops when he has numbered 2025 squares, and looks at the figure made up of all 7 numbered squares. What is the perimeter of this figure?
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80cm
90cm
120cm
180cm
360cm
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Pink Kangaroo (2025)
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