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September 7th, 2013, 12:20 PM   #1
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3d vector question

If V were to be (3/2, 3/2, 6) and Q were to be (8, 15, -20),

what would be the distance from V to Q or vice versa (in units)?
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September 7th, 2013, 12:43 PM   #2
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Re: 3d vector question

Are you familiar with the distance formula? In three dimensions, this is



where a=(a1,a2,a3) and b=(b1,b2,b3) are the two points.
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September 7th, 2013, 02:27 PM   #3
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Re: 3d vector question

Yes I am familiar with it, but I'd like to have an answer, as my textbook may be wrong.

It put 21.9 down as an answer, which sounds ridiculous.
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September 7th, 2013, 02:46 PM   #4
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Re: 3d vector question

It's approximately 30. Greater than though.
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September 8th, 2013, 02:49 AM   #5
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Quote:
Originally Posted by perfect_world
It put 21.9 down as an answer
Are you sure the question gave Q as (8, 15, -20), not (8, 15, -10)? Using (8, 15, -10), the distance would be 21.9.
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