Which of the following best describes perpendicular lines?
2 answers:
I think that your answer would be B) lines that meet at a 90 degree angle. These lines must intersect, and they have slopes that are opposite reciprocals when compared to each other.
Lines that meet as a 90° angle. ... For lines to be perpendicular, the slopes of the lines must be negative reciprocals of one another, mathematically: m1*m2=-1 Note that "slope" is velocity or change in y divided by change in x. Using any value for m1, say 3 as an example. m1=3, then m2=-1/3 tanα=dy/dx=m so Then if we use the arctan function we can see the angles of the lines, ie α=arctan3, ß=arctan(-1/3) α≈71.56°, ß≈-18.44 α-ß=90°
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