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Mathematics: Post your doubts here!

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Since CD lies in the same line as BC then it must be an integer multiple of the unit vector of BC (The integer will be the magnitude of CD).

In this case we don't know if CD is in the same direction as BC or the opposite, so it can either be a positive or a negative integer multiple of the unit vector.

CD = +/- (CD magnitude)(unit vector of BC)

OD = +/- (CD magnitude)(unit vector of BC) +OC

Thankyou!
 
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