In the diagram below, \overline{ab} \parallel \overline{df},
ab
∥
df
, \text{m}\angle dce = 103^{\circ}m∠dce=103
∘
and \text{m}\angle cef = 150^{\circ}.m∠cef=150
∘
. find \text{m}\angle b. m∠b.
a
b
c
d
e
f
103°
150°
you may assume lines that appear straight are straight, but the figure is not otherwise drawn to scale.

\text{m}\angle b=m∠b=
^{\circ}
∘