Question

1. are the lines $overleftrightarrow{ab}$ and $overleftrightarrow{cd}$ parallel?

it cannot be determined a
no b
yes c

Explanation:

Step1: Identify supplementary angle

First, find the supplementary angle of the 117° angle on line CD.
$180^\circ - 117^\circ = 63^\circ$

Step2: Compare corresponding angles

The calculated 63° angle is the corresponding angle to the 63° angle on line AB. Corresponding angles being equal confirms parallel lines.

Answer:

C. Yes