Answer:
Well, Your best answer will be is 24 mm. Because, The Pythagorean theorem states that the sum of the squares of the two legs is equal to the hypotenuse squared.
7² ₊ ײ = 25². Let's use the × to represent the unknown leg.
49 ₊ ײ = 625
ײ = 576
So, Your best choice will be is 24 mm.
Good Luck!