Find the length of the missing side. Picture included...The answer I got isn't a possibility, and I'm confused. Help?

Question

anonymous · Answer

attachment

anonymous · Answer

yea im srry i truly dont know this can u help me on this writing prompt i have tho

anonymous · Answer

Yeah, sure, tag me in your question.

anonymous · Answer

k

supernova_sonntag · Answer

a2+b2=c2

10 squared plus 19 squared = c squared 
100+361=c squared 
461=c squared
(square root the c and 461)
21.4709105536
If you round it is 21.5

anonymous · Answer

@Supernova_Sonntag can u plz come help me with my math writing prompt its talkiung abought slope

anonymous · Answer

Oh, I see what I did wrong! Thank you :)