Mark the correct alternative in each of the following: \( A B C D \) is a trapezium in which \( ...

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Mark the correct alternative in each of the following:
\( A B C D \) is a trapezium in which \( A B \| D C \). \( M \) and \( N \) are the mid-points of \( A D \) and \( B C \)
W respectively. If \( A B=12 \mathrm{~cm}, M N=14 \mathrm{~cm} \), then \( C D= \)
(a) \( 10 \mathrm{~cm} \)
(b) \( 12 \mathrm{~cm} \)
(c) \( 14 \mathrm{~cm} \)
(d) \( 16 \mathrm{~cm} \)
(1)
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