A chord of is also a common external tangent of and . Given that the length of the chord is where and are positive integers, and are relatively prime, and is not divisible by the square of any prime, find .
Isang kuwerdas ng ay isang pangkaraniwang mga panlabas na padaplis ng at . Given na ang haba ng kuwerdas ay saan at ay positive integers, at ay relatibong kalakasan, at ay hindi mahahati sa pamamagitan ng parisukat ng anumang kalakasan, hanapin .