Results are out! Find what you need...fast. Get quick advice or join the chat
x

Unlock these great extras with your FREE membership

  • One-on-one advice about results day and Clearing
  • Free access to our personal statement wizard
  • Customise TSR to suit how you want to use it

c4 vectors

Announcements Posted on
Rate your uni — help us build a league table based on real student views 19-08-2015
  1. Offline

    ReputationRep:


    In part a) (not show in the above image), they ask you to find the lengths of AB and BC. I done that correctly.. For part b, when constructing the above diagram, how do you know which way the arrows point?

    Thanks
  2. Offline

    ReputationRep:
    (Original post by xXxiKillxXx)


    In part a) (not show in the above image), they ask you to find the lengths of AB and BC. I done that correctly.. For part b, when constructing the above diagram, how do you know which way the arrows point?

    Thanks
    The arrows should be pointing away from B, hence the arrows are in the direction BA and BC.
  3. Offline

    ReputationRep:
    (Original post by raheem94)
    The arrows should be pointing away from B, hence the arrows are in the direction BA and BC.
    Why should they be pointing away from B? THanks
  4. Offline

    ReputationRep:
    (Original post by xXxiKillxXx)
    Why should they be pointing away from B? THanks
    See page#69 of the edexcel C4 book.
  5. Offline

    ReputationRep:
    (Original post by raheem94)
    See page#69 of the edexcel C4 book.
    Oh so vectors always point away from the angle?
  6. Offline

    ReputationRep:
    (Original post by xXxiKillxXx)
    Oh so vectors always point away from the angle?
    If you want to find angle ABC.

    Then the two vectors you need to consider should be in the direction pointing away from B.

    AB is pointing towards B, so we use BA rather than AB.
    CB is pointing towards B, so we use BC rather than CB.
  7. Offline

    ReputationRep:
    Work out BA and BC and use the costheta formula.
  8. Offline

    ReputationRep:
    (Original post by raheem94)
    If you want to find angle ABC.

    Then the two vectors you need to consider should be in the direction pointing away from B.

    AB is pointing towards B, so we use BA rather than AB.
    CB is pointing towards B, so we use BC rather than CB.

    (Original post by DoctorVertigo)
    Work out BA and BC and use the costheta formula.
    Ahhh thanks

Reply

Submit reply

Register

Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?
  2. this can't be left blank
    this email is already registered. Forgotten your password?
  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. By joining you agree to our Ts and Cs, privacy policy and site rules

  2. Slide to join now Processing…

Updated: June 9, 2012
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

New on TSR

Rate your uni

Help build a new league table

Poll
How do you read?
Study resources
Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.