In the adjoining figure, \( \mathrm{ABCD} \) is a rhombus. If \( \angle \mathrm{A} \) \( =70^{\c...

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In the adjoining figure, \( \mathrm{ABCD} \) is a rhombus. If \( \angle \mathrm{A} \) \( =70^{\circ} \), find \( \angle \mathrm{CDB} \)
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