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Drugi bok - 2x 10,6 cm
Obw = 2a + 2b
32 = 2 * 2x + 2 * x
32 = 4x + 2x
6x = 32 /: 6
x = 5,3 cm.
2x = 2 * 5,3 = 10,6 cm.
Pierwszy bok - 10,6 + 2 = 12,6 cm
Drugi bok - 5,3 - 3 = 2,3 cm
Obw = 2a + 2b
Obw = 2 * 12,6 + 2 * 2,3
Obw = 25,2 + 4,6
Obw = 29,8 ≈ 30 cm²