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Here is a ray vec(OA). It starts at O an...

Here is a ray `vec(OA)`. It starts at O and passes through the point A. It also passes through the point B. Can you also name it as `vec(OB)` ? Why? `vec(OA)` and `vec(OB)` are same here.
Can we write `vec(OA)` as `vec(AO)` ? Why or why not? Draw five rays and write appropriate names for them. , What do the arrows on each of these rays show?

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