In a rhombus ABCD, ∠A = 60° and AB = 12 cm. Then the

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In the rhombus ABCD, AB = AD = 12 cm.
∠BAD = 60°
∴ ∠ABD = ∠ADB = 60°
∴ BD = 12 cm. because ∆ABD is an equilateral triangle.