+2729 Let $ABCD$ be a square with side length $1.$ A laser is located at vertex $A,$ which fires a laser beam at point $X$ on side $\overline{BC},$ such that $BX = \frac{1}{2}.$ The beam reflects off the sides of the square, until it ends up at another vertex; at this point, the beam will stop. Find the length of the total path of the laser beam.
+135 Once the laser hits line BC, it will immediately be reflected to the upper right corner. This will make two right triangles, each with legs of 1 and 0.5. We can calculte the hypotenuse of each of these triangles.
12+122=h2
4/4+1/4=h2
5/4=h2
h=√5/2
Since the laser's path is two of these identical hypotenuses, we double this about to get the length of sqrt(5).
