C4 Vectors and Scalar Products
Maths and statistics discussion, revision, exam and homework help.
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Re: C4 Vectors and Scalar ProductsWhat were you using as your two vectors?(Original post by Lanter)
Hi
I am really stuck on question 8 part C
I have tried using the formula for cos(theta) but i get the wrong answer
Any help will be much appreciated
Thankyou
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Vectors a (2i+3j-1k) and b (-1i+6j+7k) that i worked out in the previous question(Original post by Thrug)
What were you using as your two vectors?
Sorry for the late reply btw
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I will try that now(Original post by ReTurd)
You might be using the wrong vectors
Find the vectors AB and AO then use the the dot product equation to find the angle.
Sorry for the late reply
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Ok thankyou(Original post by Classical Liberal)
Make sure both of the vectors have the same direction with regards to their intersection.
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Yeah i know(Original post by Thrug)
You know you have them the wrong way round if you get an obtuse angle.
If you do just do [ 180 minus your answer ] to get back to acute.
Thanks anyways
Done the question now finally
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