Given: △abc, d is a part of ac, m∠bdc = m∠abc, ad = 7, dc = 9. Find: bc, bd:ba.
a) bc = 16, bd:ba = 1:2
b) bc = 16, bd:ba = 2:1
c) bc = 18, bd:ba = 1:2
d) bc = 18, bd:ba = 2:1