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# vectors pure 1 watch

2. (Original post by Jian17)
What's the issue? Draw a diagram to help you out if you need to.
3. (Original post by Jian17)
AD = BC (parallel direction vectors with equal length)

Then can you see how to find OD?

4. I guess OD is equal to 0.5 x OA ?
5. (Original post by Jian17)

I guess OD is equal to 0.5 x OA ?
Not quite.

Note that the vectors of AB and CD are complete opposites. So the vector .

You know C and B hence you can determine BC vector, then find the point D from there.
6. hmmm I think I get it now, thanks! I'll try it later since im on the bus right now

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Updated: March 13, 2018
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