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Np.:
1. a - 10 cm
b - 5 cm
2*a+2*b = 2*10 + 2*5 = 20 + 10 = 30 cm^2
2. a - 9 cm
b - 6 cm
2*9 + 2*6 = 18 + 12 = 30 cm^2
3. a - 11 cm
b - 4 cm
2*11 + 2*4 = 22+8 = 30 cm^2