Someone help plz! And plz make sure it’s right !

Answer:
16^2 = 8^2 + x^2
x^2 = 16^2 -8^2
x^2 = 256 -64
x^2 = 192
x = sq root (192) = 13.8564064606
Step-by-step explanation:
i don't know if this is right, if it is wrong i'm sorry, but basically it is 12.7m