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a² = 100
a = √100 = 10 cm
121/10 = 1,21 cm 21% = 0,21
121 = a1,21a
1,21a² = 121 / : 1,21
121 = a * 1,21a
1,21a² = 121 / : 1,21
a² = 100
a = √100 = 10 cm
b = P/a = 121/10 = 12,1 cm