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3a=b
podstawiam b z drugiego do pierwszego:
2a+6a=64
8a=64
a=8 cm, więc b=24 cm
P=8*24
P=192 cm²
8x=64
x=8
Krotszy bok ma 8 cm a dluzszy ma 24.
3x-drugi bok
Obw.=2×x+2×3x
2x+6x=64cm
8x=64cm //:8
x=8cm
8cm-pierwszy bok
24cm-drugi bok
P=8cm×24cm=192cm²