\( A, B, C \) and \( D \) are concyclic. \( A C \) bisects \( B D \). If \( A B=9 \mathrm{~cm}, ...

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\( A, B, C \) and \( D \) are concyclic. \( A C \) bisects \( B D \). If \( A B=9 \mathrm{~cm}, B C=8 \mathrm{~cm} \), and \( C D=6 \mathrm{~cm} \), then find the measure of \( A D \).
(a) \( 7 \mathrm{~cm} \)
(b) \( 10 \mathrm{~cm} \)
(c) \( 12 \mathrm{~cm} \)
(d) \( 15 \mathrm{~cm} \)
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