Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
t =(((y4-y3)/((y2-y1)+y1-y3))-((x4-x3)/((x2-x1)+x1-x3)))*2
t =(((y4-y3)/((y2-y1)+y1-y3))-((x4-x3)/((x2-x1)+x1-x3)))*2
Natural Language
Math Input
