<u>Parallel lines</u> are lines that run side-by-side without touching or intersecting!
<u>Perpendicular lines</u> intersect/cross and can also make 90° angles (those little green boxes in the picture) in their corners!
Sets of parallel lines:
Sets of perpendicular lines:
Y=6.21
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I believe the answer would be a.
1/4, 1/2, 4/7, and 2/3. I hope this helps!
