This is like a matching question. Here's what I mean by this. We know Triangle BCA and Triange JKL are congruent. So, what we have to do is match the side lengths together.
So the first side of BCA matches with JKL, the second side of BCA matches with JKL, the third side of BCA matches with JKL.
When a problem has no solution you'll end up with a statement that's <em>false</em>. For example: 0=1 This is false because we know zero can't equal one. Therefore we can conclude that the problem has no solution.