H and r and space angle A B C space i s space a d j a c and n t space t o space angle C B D space b and c a u s and space t h and s and a n g l and s space h a v and space a space c or m m or n space s i d and space C B space a n d space a space c or m m or n space v and r t and x space B.
H e r e space angle A B C space i s space a d j a c e n t space t o space angle C B D space b e c a u s e space t h e s e a n g l e s space h a v e space a space c o m m o n space s i d e space C B space a n d space a space c o m m o n space v e r t e x space B. 