Respuesta :

Answer:

√19

Step-by-step explanation:

Pythagoras's theorem:

[tex]a^{2} +b^{2} =c^{2}[/tex]

Where side c is the hypotenuse and sides a and b do not matter if switched.

9²+b²=10²

81+b²=100

b²=100-81

b²=19

b=√19