.
1.  Make a sketch.
    Let ABC be your right-angled triangle with the right angle vertex A.
    Let BD and CE be these two medians (|CE| = 2*sqrt(13) and |BD| = sqrt(73), for certainty).
    Let x and y be the lengths of the legs AB and AC respectively.
2.  From the right triangle ACE and ABD you have
     =
 =  (1)
   (1)
     =
 =  (2)
or
   (2)
or
     =
 =  (3)
     (3)
     =
 =  ,      (4)
By adding equations (3) and (4), you get
,      (4)
By adding equations (3) and (4), you get
     = 4*13 + 73 = 125,   or
 = 4*13 + 73 = 125,   or
     = 100.
3.  Thus
 = 100.
3.  Thus  = 100.
    It is the length of the hypotenuse squared,
 = 100.
    It is the length of the hypotenuse squared,  .
    Hence, the length of the hypotenuse
.
    Hence, the length of the hypotenuse  =
 =  = 10 cm.
 = 10 cm.
Solved.    Answer:   The length of the hypotenuse is 10 cm.