Answer:
B
Step-by-step explanation:
Using Pythagoras' identity in the right triangle
let h be the hypotenuse, then
h² = 6² + 18² = 36 + 324 = 360 ( take the square root of both sides )
h = [tex]\sqrt{360}[/tex]
= [tex]\sqrt{36(10)}[/tex]
= [tex]\sqrt{36}[/tex] × [tex]\sqrt{10}[/tex]
= 6[tex]\sqrt{10}[/tex] → B
