Answer: 26
Step-by-step explanation: Since you are given the measures of two legs which are 24 (XY) and 10 (XS), you just need to use the formula a^2+b^2=c^2 to find the hypotenuse which is RY.
10^2 + 24^2 = c^2
100 + 576 = c^2
676 = c^2
26 = c
RY = 26
