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4a-długość drugiego boku
2a+2*(4a)=20cm
2a+8a=20cm
10a=20cm /:10
a=2cm
P=2cm* 4*2cm=2cm*8cm=16cm²
Odp. Pole wynosi 16cm².
20= 2(x+4x)
20 = 10x / :10
2 = x
8 razy 2 = 16
pole wynosi 16 cm