If \( \angle A C B \) is a right angle and \( A C=C D \) and \( C D E F \) is a parallelogram. I...
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0If \( \angle A C B \) is a right angle and \( A C=C D \) and \( C D E F \) is a parallelogram. If \( \angle F E C=10^{\circ} \), the \( \angle B D E \) equals
(a) \( 60^{\circ} \)
(b) \( 70^{\circ} \)
(c) \( 50^{\circ} \)
(d) \( 55^{\circ} \)
\( +\underbrace{+i q i}_{0} \)
\( E \)
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