1.

(i) d(P, R) = 7, d(P, Q) = 10, d(Q, R) = 3 ​

Answer»

Given, d(P, R) = 7, d(P, Q) = 10, d(Q, R) = 3 d(P, Q) = 10 …(i) d(P, R) + d(Q, R) = 7 + 3 = 10 .. .(II) ∴ d(P, Q) = d(P, R) + d(Q, R) …[From (i) and (ii)] ∴ Point R is between the points P and Q i. e., P – R – Q or Q – R – P. ∴ Points P, R, Q are COLLINEAR.



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