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12 cm - drugi bok
x + 5cm - przekątna
(x+5)^2=12^2+x^2
x^2+10x+25=144+x^2 // -x^
10x+25=144 // -25
10x=119
x=11,9
I bok = 11, 9cm
Przekątna = 11,9+5cm = 16,9
Pole = 11,9*12=142,8 cm
Obwód = (11,9*2)+(12*2) = 23,8 +24 =48,8