Hello!
Using the Pythagoras Theorem we can solve this equation. a

, where a and b represent legs and c represents the hypotenuse.
Again YOU CANNOT SQUARE ROOT EVERYTHING:

9+16=25
BUT:
3+4 \\eq 7!!
To continue:

64+ [tex] b^{2} [\tex] = 100
[tex] b^{2} [\tex] = 36
b = 6
The other leg's length is 6.
Please feel free to message me with any questions!
Your friend,
bobbyet101