Verified Answer :

This is a pythagorean triple --> 3-4-5
Although you notice it is doubled but with the same pattern --> 6-8-10

Thus, the hypotenuse is 10.

H square = b square + p square
H = square root b square+ p square
H= square root 8 square+6 square
H= square root 64+36
H= square root 100
H= 10