#21 of Sept 2017 Grade 10 CSAT (Korean SAT) Mock test

Geometry Level 3

There is a triangle \(ABC\) with side lengths \(\overline{AB}=2\sqrt{3}\) and \(\overline{BC}=2\) as shown on the right. \(D\) is a midpoint of \(\overline{BC},\) satisfying \(\overline{AD}=\sqrt{7}.\)

Let \(E\) be the point of intersection between \(\overline{AB}\) and the bisector of \(\angle ACB.\) \(\overline{CE}\) meets with \(\overline{AD}\) at point \(P,\) and the bisector of \(\angle APE\) meets with \(\overline{AB}\) at point \(R.\) An extension of \(\overline{PR}\) meets with \(\overline{BC}\) at point \(Q.\)

Given that the area of \(\triangle PQC\) is \(a+b\sqrt{7}\) times larger than that of \(\triangle PRE\) for some rational numbers \(a\) and \(b,\) find the value of \(ab.\)

This problem is a part of <Grade 10 CSAT Mock test> series.


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