Answer:
60 degrees
Step-by-step explanation:
ebd + dbc = 180 because they make a straight line
120 + dbc = 180
dbc = 60
the three angles in a triangle always add up to 180 degrees
bcd + dbc + cdb = 180
60 + 60 + cdb = 180
120 + cdb = 180
cdb = 60
