Răspuns:
Explicație pas cu pas:
a/b = 2
a = 2b
a^2 + b^2 = 405
4b^2 + b^2 = 405
5b^2 = 405
b^2 = 405 : 5 = 81
b = 9 dam
a = 2*9 = 18 dam
A = a*b/2 = 18*9/2 = 81 dam^2 = 81 ari
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P = 18 dam + 9 dam + 9√5 dam = 27 dam + 9√5 dam
9*2,23 = 20,07 dam
P ≈ 27 dam + 20,07 dam = 47,07 dam > 47 dam