Question 1144832
Pythagoras says: a^2 + b^2 = c^2, where c^2 is the hypotenuse
Using this formula, your problem says:
a^2 + 10^2 = 26^2
a^2 = 26^2 - 10^2
a^2 = 676 - 100
a^2 = 576
(sqrt a^2) = sqrt 576
a = 24