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Vectors help

http://www.ocr.org.uk/Images/59552-question-paper-unit-4724-01-core-mathematics-4.pdf

Question 9i)

I can't visualize the angle that needs to be found...

Reply 1

Music99

Original post by IShouldBeRevising_

http://www.ocr.org.uk/Images/59552-question-paper-unit-4724-01-core-mathematics-4.pdf

Question 9i)

I can't visualize the angle that needs to be found...

Draw a sketch.

Reply 2

Ateo

Original post by IShouldBeRevising_

http://www.ocr.org.uk/Images/59552-question-paper-unit-4724-01-core-mathematics-4.pdf

Question 9i)

I can't visualize the angle that needs to be found...

It is not easy to visualize it, but you don't really need to. Essentially what you have to do is find the point P and then find the angle. Hint: Use the scalar product.

Reply 3

Goods

find the position of point p.
then the co-ordinates of point p are also the position vector OP.
then use |a||b|=a.b/cos(x)
by subbing in OP as a and the vector of the line L (1,-1,2) as b then solve

Reply 4

IShouldBeRevising_

Original post by Goods

find the position of point p.
then the co-ordinates of point p are also the position vector OP.
then use |a||b|=a.b/cos(x)
by subbing in OP as a and the vector of the line L (1,-1,2) as b then solve

Original post by Ateo

It is not easy to visualize it, but you don't really need to. Essentially what you have to do is find the point P and then find the angle. Hint: Use the scalar product.

Original post by Music99

Draw a sketch.

Thank you

Reply 5

ErikJNakano

Thanks for the informative specially for me as I am a B.Sc maths Student and having so many difficult problems in maths. The easiest thing in maths is the only matrix. .

Thanks again for helping this problem !!!

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