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The projection of segment [PQ] on the co...

The projection of segment [PQ] on the co-ordinate planes are-9, 12, -8 respectively. The direction-cosines of PQ are :

A

`lt (-9)/17,12/17,(-8)/17 gt `

B

`lt (-9)/289 , 12/289 , (-8)/289 gt`

C

`lt (-9)/sqrt17 , 12/sqrt17, (-8)/sqrt17 gt`

D

`lt -9, 12 ,-8 gt`

Text Solution

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The correct Answer is:
A
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