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Dear student,

Your question appears to be incomplete, as it appears to have a associated diagram with it.
But assuming the point A and B in the simplest manner, here is the solution


As we don't have any fair idea about the point P, it is impossible to come up with any result for third part.
If you have anything else in mind or if the associated picture along with this question is a bit different, then we would request you to repost a complete question so that our expert can provide you some meaningful help. 
Look forward to hearing from you again!

Regards,

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