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core 4 vectors help

totoro1997

Hi,
Can i have some help on question a. I know the vector for OA is xi and OC is a reflection of OB so they will both have the same 'i' bit but will have different signs in front of the 'j' bit. any help will be much appreciated. :smile:

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Reply 1

PhysicsMathsTut

Using the triangle with the 30 degree angle you drew, you can find the i and j for B

Reply 2

totoro1997

Original post by PhysicsMathsTut

Using the triangle with the 30 degree angle you drew, you can find the i and j for B

Thank you! I've worked it out now :biggrin:

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