In a triangle PQR, PS is the angle bisector of ∠ QPR and ∠ QPS = 60°. What is…

GATE · 2015 · CS · Set 2 · General Aptitude

In a triangle PQR, PS is the angle bisector of ∠ QPR and ∠ QPS = 60°. What is the length of PS?

1. A.

   $\frac {(q + r)} {qr}$

2. B.

   $\frac {qr} {q + r}$

3. C.

   $\sqrt {(q^2 + r^2)}$

4. D.

   $\frac {(q + r)^2} {qr}$

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