ABCD is a straight line

http://img125.imageshack.us/img125/3940/mathsbw8.jpg

O is a point so that OA =aand OB =b

B is the midpoint of AC

C is the midpoint of AD

Express in terms ofaandbthe vectors:

(i) AC

(ii) OD

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- June 10th 2007, 10:25 AMDanielisewvector question
ABCD is a straight line

http://img125.imageshack.us/img125/3940/mathsbw8.jpg

O is a point so that OA =**a**and OB =**b**

B is the midpoint of AC

C is the midpoint of AD

Express in terms of**a**and**b**the vectors:

(i) AC

(ii) OD - June 10th 2007, 10:54 AMCaptainBlack