First slide

Straight lines in 3D

Question

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

Easy

A

0
B

1
C

2
D

infinite

Solution

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

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