Find missing side of triangle, help!

2√10 km

Step-by-step explanation:

By Pythagoras theorem,

x^2 + 9^2 = 11^2

x^2 + 81 = 121

x^2 = 121 - 81

x^2 = 40

= 4 x 10

x^2 = 2^2 x 10

x = 2√10 km

I hate saying I believe, but I am not totally sure with this one. At least its better than you getting no answer. Anyway, ugh I hate saying "I believe" its so un-reassuring. I believe the answer is the third one.

Step-by-step explanation:

It can't be the second one, cause that doesn't matter.

It cant be the last one. A circle can't be a function because if you do the vertical line test, you will find to points on the vertical line instead of one.

It can't be the first one because that would also fail the line test. If it opens upwards, than that would mean that there are multiple points on the vertical line test.

--Your best answer is the third one--

(If you need a second-best answer, it will be the first one, cause that is the one that makes the second-best sense)

PLEASE MARK BRAINLIEST! I WOULD REALLY APPRECIATE IT IF YOU DID. I JUST WANT ONE MORE BRAINLIEST...