Just answer number 21 please :)
![Just answer number 21 please class=](https://us-static.z-dn.net/files/d4e/e2e4dcc23d47ee8d669c02bfe88f2b94.png)
Answer:
a,d & d,b
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Question # 20 pair of skew lines ~
Question # 21 perpendicular lines ~
Question # 22 pair of parallel lines ~
Question # 23 pair of corresponding angles ~