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# Vectors Question, help wanted. watch

1. Question 2 on the picture attatched. Thanks.
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2. (Original post by sb1986)
Question 2 on the picture attatched. Thanks.
use the t values as the direction of the original line
stick t=2 into the original line to find the turning point
subtract this point from the end point to find the direction of the second line
use a.b = |a||b|[email protected] to detemine @
3. (Original post by El Chueco)
use the t values as the direction of the original line
stick t=2 into the original line to find the turning point
subtract this point from the end point to find the direction of the second line
use a.b = |a||b|[email protected] to detemine @
Thats the part I was doing wrong, cheers...
4. ah man i still gettin 142.7, to get the right answer I have to subtract that from 180...but why?
5. my bad... you need to use the negative of the t values for the direction, ie so, you have two directions out from the point as opposed to one in and one out...
6. right i've woken up now... ignore my last post. the angle turned to get onto the new bearing is 180 - the angle between the bearings (the one the dot product works out)

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