1/3x17/1=51/1 that's how you do it by explaining
Assuming this is a square because it is. Using the distance formula you can find that one side is equal to 6sqrt(2). Thus you can find that the area is 72 by squaring 6sqrt(2)
It would be the one where measurement 1m is the side of the triangle, measurement 0.75m is the bottom of the triangle, and measurement 2m is the long side of the rectangle