Answer:
128 km²
Step-by-step explanation:
a²+b²=c²
So, one of the sides equals 128 square rooted, because 8²=64, and 64 times 2 equals 128. The area of a square is side times side, so it's side². So, instead of simplifying the square root of 128, get rid of the square root. The answer is 128 km²
