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|AB|=a
|BC|=b
Pole:
P = 4a = 8b
4a = 8b |:4
a = 2b
Obwód:
L = 2a + 2b = 36
2a + 2b = 36 |:2
a + b = 18
Zamiast a wstawiam 2b wyznaczonego z pola:
2b + b = 18
3b = 18 |:3
b = 6
P=8b = 8*6 = 48