a = 4 cm
b = 4cm÷2
b = 2 cm
Obwód = 2a + 2b
Obw = 2 * 4cm + 2 * 2cm
Obw = 8 cm + 4 cm
Obw = 12 cm
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a = 4 cm
b = 4cm÷2
b = 2 cm
Obwód = 2a + 2b
Obw = 2 * 4cm + 2 * 2cm
Obw = 8 cm + 4 cm
Obw = 12 cm