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Math help . Vectors . Plzzz

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ailg1996

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Hey guys plese help me with this vectors question . . . .Btw it is november 2003 paper 1 I couldnt do the last part. Plz do tht 1 with the method and explanation Thank You :)
 
abcde

abcde

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AOA! :)
(b) (ii) Observe that triangles OAC and OCD have the same base, OC. So the ratio of their areas would be equal to the ratio of any two corresponding lengths of the triangles. Previously, you must have calculated vectors OD and AC, which shows that OD = 1/3 AC.
=> Area of triangle OCD = 1/3 x 18 = 6 square units.
Hope this was of some help! :)
 
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