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x-4 - drugi bok
2x+2(x-4)=16
4x-8=16
4x=16+8
x=24/4
x=6
6-4=2
P=6*2=12
x-4- 2 bok
x+x-4=16
2x-=12
x=6
x-4=2
p=a*b
p=2*6
p=12 cm kwadratowych
4cm + 4cm= 8 cm - dluzszy bok
P = 8cm razy 4 cm =24 cm