Question

look at this diagram: if $overleftrightarrow{bd}$ and $overleftrightarrow{eg}$ are parallel lines and $mangle efh = 121^{circ}$, what is $mangle bcf$?

Explanation:

Step1: Identify angle - relationship

$\angle EFH$ and $\angle BCF$ are corresponding angles.

Step2: Use property of corresponding angles

For parallel lines $BD$ and $EG$, corresponding angles are equal. Since $m\angle EFH = 121^{\circ}$, then $m\angle BCF=m\angle EFH$.

Answer:

$121$