Question

on the number line the co-ordinates ofP,Q,R are 5,8,-15 respectively then which of the statement is true?
1.d(PQ)=d(QR)+(RP)
2.d(PR)=d(RQ)+d(PQ)
3.d(RQ)=d(PR)+d(PQ)
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Answer 1

Answer:

Option (3) is correct.

d(QR) =23,d(PR) =20,d(PQ)=3