Typically a good place to start with problems like these is just to write down every piece of information you're given and then see what else you can deduce. For instance, you might note that triangle AEG is a right triangle. What does that tell you about the length of AG? Also note that the larger triangle GAT is also a right triangle. What does that tell you about the length of AT? Using this new information, what, then, can you say about the perimeter of the triangle? What can you say about the area of the triangle? With only the information given, I don't see any way to determine a numerical value of either the perimeter or the area, but you can definitely create an expression for both, in terms of x.