Answer:
10 mm
Step-by-step explanation:
Using Pythagoras' identity with hypotenuse h
The square on the hypotenuse is equal to the sum of the squares on the other 2 sides, that is
h² = 9² + ([tex]\sqrt{19}[/tex] )² = 81 + 19 = 100 ( take the square root of both sides )
h = [tex]\sqrt{100}[/tex] = 10