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August 23rd, 2013, 05:07 PM   #1
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Calculate the acute angle between the lines with equations

and

using the 2 direction vectors

and




I get about , but on W|F it looks closer to .

Last edited by skipjack; April 30th, 2016 at 03:43 PM.
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August 23rd, 2013, 05:48 PM   #2
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Re: Calculate the acute angle between the lines with equatio

Quote:
Originally Posted by bigwave
Calculate the acute angle between the lines with equations

and

using the 2 direction vectors

and




I get about but on W|F it looks closer to
I think you accidentally took the arcsin of



rather than the arccos.
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August 24th, 2013, 03:59 PM   #3
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Re: Calculate the acute angle between the lines with equatio

You're right, I forgot to use on it.
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