So in finding the value of y we are actually finding the adjacent.
Formula: b^2 = c^2 - a^2
y^2 = 26^2 - 18^2
y^2 = 676 - 324
y^2 = 352
Now we are gonna find the square root of both sides.
y^2 (square root) = 352 (square root)
y = 19
Value of y = 18.76 or 19