In fig. \( A B C D \) is a rhombus. The value of \( (y-x) \) is (a)...

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In fig. \( A B C D \) is a rhombus. The value of \( (y-x) \) is
(a) \( 40^{\circ} \)
(b) \( 50^{\circ} \)
(c) \( 20^{\circ} \)
(d) \( 10^{\circ} \)
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