Answer:
10 centimeters
Step-by-step explanation:
to find the answer for this question, we have to use the Pythagorean theorem. which is 
we consider both of the leg as a and b, and c as the hypotenuse.
in this question, we can say a is 24 and c is 26, we have to find b.
now plug in the number:
24² + b² = 26²
576 + b² = 676 <u>subtract 576 from both side</u>
b² = 100 <u>Square root both side </u>
b = √100
b = 10