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# find the position vector OA watch

1. OABCDE is a regular polygon.
2. I have no idea about OA VECTOR and my exam wednesday
3. (Original post by Deffect)
All sides of the polygon have equal length. What is the vector BC in terms of b and c?
4. I solved this part and answer c-b
I need OA position vector
5. if you know that it is regular, then you can picture the line OB as being upside-down (C to A) and still be exactly the same length (which is b) and then you can simply trace the path from O to C to A. (remember to check the direction of the arrows)
6. (Original post by Deffect)
I solved this part and answer c-b
I need OA position vector
and you can find DC now which is the same as OA because it is parallel and has equal distance.
7. I don't understand .. Can you show a full work to solve this question ?

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