1 Answer

Pfrank · Answer 1 · 2023-08-23T05:46:56+0000

We can know

$CD\perp\text{ EF}$

Because they form an angle of 90°

$CD\perp IJ$

Because they form an angle of 90°

$AB\perp GH$

Because they form an angle of 90°

We only can know

$EF\parallel\text{ IJ}$

Because both form an angle of 90° with the same line in this case CD

therefore the correct answer is the first one

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