<span><span>Simpliest form is a^2/a^2 to get 1
</span></span>
Although I'm going to answer this question, I have to point out that this problem is NOT stated clearly. The problem being we don't know if angle AMV is a right angle.
But I'm assuming it is and thus we need to use the Pythagorean theorem.
AV=
AV=13
Therefore answer is C. :D