OG中的一道题，不明白解释，请大家帮忙看一看。谢谢。

原题没有图

In ΔPQR, if PQ = x + 2, and PR = y, which of the three angles of ΔPRQ has the greatest degree measure?

(1)   y = x + 3

(2)   x = 2

答案选A，我觉得应该选E，因为只给了两条边的条件，不知道第三条边

解释中说因为y>x+2，所以PR就是最长的，那么QR呢？没有考虑大QR呀

解释中关于(2)的解释我也不明白，x=2，怎么PQ=2呢？PQ不是等于x+2，

该等于4吗？

Explanation:

In any triangle, the largest angle is opposite the longest side.  To determine the longest side it suffices to determine whether y>x+2. Since x+3>x+2, it follows from (1) that y>x+2. Statement (1) alone is therefore sufficient.  From (2) it follows that PQ=2 and QR=4.  Thus, y can be any value between 2 and 6; it follows that y>x, but it cannot be concluded that y>x+2. Statement (2) alone is therefore not sufficient.  Therefore, statement (1) alone is sufficient, but statement (2) alone is not sufficient to answer the question.