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.
triangle(-1/5,2/5)(17/5,11/5)(-2,4)
triangle(-1/5,2/5)(17/5,11/5)(-2,4)
Natural Language
Math Input
Extended Keyboard