Answer:
Step-by-step explanation:
to make life easier, i'll give both angles letters
Angle ABC= x
Angle CBD= y
x= y(1/3)
x+y=180
now substitute
y(1/3) +y =180
y(4/3) =180
y(4/3) * (3/4) = 180 * (3/4)
y= 135
CBD is 135 degrees
