Squares \(AXYZ\) and \(A_{1}X_{1}Y_{1}Z_{1}\) are inscribed in the two congruent right triangle \(ABC\) and \(PQR\), as shown below. Find \(AB+AC\) if \([AXYZ]=441\) and \([A_{1}X_{1}Y_{1}Z_{1}]=440\).

注:[]表示面积。

(第五届AIME1987 第15题)