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x - podstawa
1/4 x² + 4/9 x² = 225
9/36 x² + 16/36 x² = 225
25/36 x² = 225 /: 25/36
x² = 324 /√
x = 18
Obw=15cm+15cm+18cm=48cm
Odp: Obwód ma 48 cm.