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.
polygon(-2,1),(2,2),(2,1)(-2,1),(-1/2,7/2),(2,2)
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random