For a class scrapbook, two square pieces of paper, of sides 20 cm and 9 cm, are pasted onto a page. The smaller piece is pasted over one corner of the bigger piece, as shown. The part of each piece that is not covered by the other is shaded. How much bigger is the shaded part of the 20 cm piece than the shaded part of the 9 cm piece?
Opening the drawing…
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