harding6698
11.10.2019 •
Mathematics
Which of the following best describes perpendicular lines?
a. lines that are not in the same plane
b. lines that meet at a 90 degree angle
c. lines that meet at a 45 degree angle
d. lines that are coplanar and do not intersect
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Ответ:
...
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°
Ответ:
3 of 1/5
Step-by-step explanation: