How can you prove a triangle is a right triangle?

Question

joel_the_boss · Answer

Well i found this can it should help. :) 

Find the slope of each line segment. If two of them are negative inverses of each other (like 3/8 and -8/3) then they make a 90 degree angle). 

Oh, and $$\huge_{\color{red}{\star} ^\color{blue}{{\bigstar} ^\color{green}{{\star} ^\color{magenta}{{\bigstar }}}}}\color{cyan}{Welcome ~~To~~Openstudy!!}~^{\color{red}{\star} ^\color{blue}{{\bigstar} ^\color{green}{{\star} ^\color{magenta}{{\bigstar }}}}} $$:)

joel_the_boss · Answer

Correction *Well I found this and it should help* :)

anonymous · Answer

THANK YOU!

anonymous · Answer

what are saying is that if the adj slope times opp slop equal negative then they are perpendicular