First slide

Introduction to 3-D Geometry

Question

If $(1, - 2, - 2)$ and (0,2,1) are the dr's of two lines then the dr's of a line perpendicular to both the lines are

Moderate

A

(2,1,2)
B

(-2,1,2)
C

(2,-1,2)
D

(2,1,-2)

Solution

Use $(b_{1} c_{2} - b_{2} c_{1}, c_{1} a_{2} - c_{2} a_{1}, a_{1} b_{2} - a_{2} b_{1})$

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