First slide

Straight lines in 3D

Question

The number of lines perpendicular to $y -$ axis and lying in $x z -$ plane is

Easy

A

0
B

1
C

2
D

infinite

Solution

Any line in $x z -$ plane is perpendicular to the $y -$ axis, so there are infinite lines which are perpendicular to $y -$ axis and lying in plane $x z -$

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