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obwód:
2 x 10cm + 2 x 6cm = 32cm
pole:
P= 10 x 6= 60cm2
Kwadrat:
obwód: 32cm
bok: 32cm / 4 = 8cm
pole:
P= 8 x 8= 64cm2
najlepiej obliczyc proporcjami:
64cm2 - 100%
60cm2 - x%
x= 60 x 100 / 64= 93,75%