Answer:
the missing side length is 8 (i don't think you need to add the power of 2)
Explanation:
I believe what you have to use is
with the 10 being c, and 6 being a.
so then you would use the equation as such,
resolve the numbers to power first,
however, to officially get the answer you must square root 64 in order to get the
variable,
Notes: I hope this helps, however, I don't think I used the correct formula to get the right answer!