Which of these lines are perpendicular to each other?
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Which of these lines are perpendicular to each other?
Let's remember that perpendicular lines form a 90-degree angle.
In each of the answers, we will draw the letter T at the intersection point of the lines.
Let's examine figure A:
We notice that the lines do not form a right angle and therefore are not perpendicular.
Let's examine figure B:
We notice that the lines do not form a right angle and therefore are not perpendicular.
Let's examine figure C:
We notice that the lines do not form a right angle and therefore are not perpendicular.
Let's examine figure D:
We notice that the lines do form a right angle therefore are perpendicular lines.
What do the four figures below have in common?
Look for lines that form an L-shape or T-shape. One line should be perfectly horizontal and the other perfectly vertical, or they should meet at what looks like a perfect square corner.
All perpendicular lines intersect, but not all intersecting lines are perpendicular! Perpendicular lines are a special case where the intersection angle is exactly .
The small square is the right angle symbol! It's mathematical notation that confirms the angle measures exactly . This symbol makes it easy to identify perpendicular lines.
Yes! Perpendicular lines don't have to be horizontal and vertical. They just need to meet at a angle. Think of an X rotated 45 degrees - those lines are still perpendicular.
Always look for the right angle symbol (small square) rather than relying on visual estimation. Drawings might not be perfectly to scale, but the mathematical symbols are accurate.
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