In the diagram below, lines Ef and GH are ____.
A. perpendicular
O B. skew
C. parallel
![In the diagram below lines Ef and GH are A perpendicular O B skew C parallel class=](https://us-static.z-dn.net/files/db8/9acb4b334aa2586d35000fcaec739bf4.png)
There is an angle of 90 degrees given between the two lines.
When 2 lines are at a 90 degree angle from each other they are perpendicular.
Answer: A. Perpendicular