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|dw:1352470604128:dw| I know it looks so wrong, but this what I could think of ._.
I think you are right but I'm not sure why they needed a triangle for that they could just use a line
you can check your reasoning like this. Pick a point on the circle. How far is it from point R? By construction, it is RQ away from point R. So your circle meets the requirement
On the other hand, pick any point not on the circle. Then (by definition) that point is not RQ away from point R. It is either further away or closer. So only the points on the circle work.
they just wrote the definition of radius more or less but why they added the triangle that's what I don't understand
why they added the triangle ? Either to confuse people, or the sentence does not mean what I think it means. I'm going with the first option.
So I have to use construction in here too? -.- But what I did is correct, right?
I believe so :)
why they added the triangle ? or maybe there are other parts to the question that use this triangle?
No, there isn't any other parts. Maybe they just want to confuse us..