Which lines are perpendicular to each other?
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Which lines are perpendicular to each other?
Let's remember that perpendicular lines are lines that form a right angle of 90 degrees between them.
The only drawing where it can be seen that the lines form a right angle of 90 degrees between them is drawing A.
Which of the diagrams contain parallel lines?
Look for the small square symbol at the intersection point! This square indicates a 90° angle. Without this marker, you cannot assume lines are perpendicular even if they look like they might be.
All perpendicular lines intersect, but not all intersecting lines are perpendicular! Intersecting lines can meet at any angle, while perpendicular lines must meet at exactly 90°.
Parallel lines never touch or intersect, so they can't form any angle at all! Since perpendicular lines must intersect at 90°, parallel lines can never be perpendicular.
Absolutely! Lines don't have to be horizontal and vertical to be perpendicular. Any two lines that meet at exactly 90° are perpendicular, regardless of their orientation.
Without the square symbol, you cannot assume they're perpendicular! In math problems, visual markers are crucial - if there's no right angle symbol, the lines aren't considered perpendicular.
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