I hope and pray that this thread does not get neg feedback....
Ok I am trying to find the area of three points;
A=(-2,5) B=(1,3) C=(-1,0)
I am following the text books examples on how to do this and so far it's working out. BUT in the text/example it talks about the "right angle is at vertex B."
MY question is (to understand this); what does the word vertex mean?
Thank you in advance for any reply/help