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Two ways to determine if two line segments are perpendicular:

1. Determine the angle formed: if the angle made by the two line segments is 90 degrees, then they are perpendicular. This can sometimes be done visually if the graph has grids, but probably not what the question is asking you to do.

2. Compare slopes*: if the slopes are negative inverses of each other, they are perpendicular. For example, if the slope of one line is 5, the slope for the other line would need to be -1/5, or -0.2. An easy way to remember, is if the product of the two slopes is -1, they are perpendicular.

*Side note: slope is "rise over run", or change in y divided by change in x

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Q: Which figure contains a pair of perpendicular line segments?
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