C because adjacent angles share a common line as do angles 2 and 4.
Hope this helps :)
Slope of Side EF- 3
Slope of Side FG- 2/-6
Slope of Side GH- 3
Slope of Side HE- 2/6
- 8 + 6 = - 2
Step-by-step explanation:
-2 = [-8] + 6
<u>-TheUnknownScientist</u>