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b- drugi bok = 3a
Obw= a+a+3a+3a=8a
168=8a
a=21
3a=63
P=a*b= 21*63=1323 ;)
bok b - 3x
Wzór ogólny na pole prostokąta : a * b
8x = 168cm
x = 21cm
bok a =21cm
bok b=63cm
Pole: a * b
21cm * 63cm = 1323cm kwadratowych