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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