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0,75 a - długość drugiego boku
2a + 2*0,75a =42
2a+1,5a=42
3,5a=42?:3,5
a=42:3,5=420:35=12
0,75*12=9
P= 12*9=108cm2
x dlugosc
y szerokosc
0,75x szerokosc
2*0.75x+2x=42
3,5x=42
x=12
0,75*12=9
9*12=108