Answer:
110 ,also I think it will be a lot greater than 66 because it is slightly more than half of the whole number.
Step-by-step explanation:
No, it isn't.
Pythagorean theorem is x^2 + y^2 = z^2.
6^2 + 8^2 = 9^2
36 + 64 = 81
100 = 81
So, it isn't.