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Perpendicular lines

Expert replies
by smclean23 » Tue Aug 19, 2008 5:24 am
In the xy plane, line k passes through the point (1,1) and line m passes thru point (1,-1). Are lines k and m perpendicular to each other?


1. Lines k and m intersect at point (1,-1)
2. Line k intersects at the x axis at point (1,0).





Answer is E.


Does a perpendicular mean that the lines have to form to be 90 degrees? If so then I can take it from here....
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Source: — Problem Solving |

Re: Perpendicular lines

by 4meonly » Tue Aug 19, 2008 6:12 am
smclean23 wrote: Does a perpendicular mean that the lines have to form to be 90 degrees? ....
unambiguously yes
in GMAT, in non-Euclid geometry is is not necesserely :-)
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