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P=a²
225cm²=a²
a=15cm-bok kwadratu
O=4a
O=4*15cm
O=60cm-obwód
3.
P₁=1,44cm²
P=a²
1,44cm²=a²
a=1,2cm
P=2,56cm
P=a²
2,56cm²=a²
a=1,6cm
O=3*1,6cm+3*1,2cm-(1,6cm-1,2cm)
O=4,8cm+3,6cm+0,4cm
O=8,4cm+0,4cm
O=8,8cm-obwód figury
3)