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L=60cm
60=4a |:4
a=15cm
P=a²
P=125cm²
b)
P=a²
P=25cm²
a=√25cm²
a=5cm
L=4a
L=20cm
60cm=4a |:4
15cm=a
P=15 do kwadratu
P=225cm2
B)
25cm2=a2 |:2
5cm=a
obw: 5*4= 20cm
6dm:4=1,5
pole kwadratu-a*a
1,5*1,5=2,25dm²
Pole kwadratu wynosi 2,25 dm²
2.
25:5=5
bo 5*5=25
Obw= 4*a
4*5=20
Obwód kwadratu wynosi 20cm