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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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How many sets of perpendicular line segments make up the figure above?
2
What are two line segments that meet and form a right angle?
They are perpendicular line segments
How many sets of perpendicular lines does a octagon have?
Each of the eight line segments is perpendicular to 2 line segments. So there are 8 pair in all.
What is a line segments or ray that passes through the midpoint of a side and is perpendicular to the side?
A perpendicular bisector.
Is a pentagon perpendicular?
No, a pentagon is not perpendicular. The word perpendicular describes two lines (or line segments) that meet at a 90o angle.
