Question

Which line must be perpendicular to ​

Answer 1

I think its GI. Could be HJ too. Here's a little reminder about intersecting, parallel, and perpendicular lines...

Answer 2

Answer:  Line must be perpendicular to ​ Line CF is Line GI .

Step-by-step explanation:

From the given picture, we are given three lines (AD , BE and CF) intersecting other two lines (QI and HJ).

We can see that Line AD and Line CF is making right angle with line GI>

Also, we know that the perpendicular lines intersect at right angles to each other.

Hence, the Line must be perpendicular to ​ Line CF is Line GI.