GeoData is a website to help you find geometry theorems. Just input keywords, you can obtain the details of result theorems. The name, statement both in English and Chinese, and picture of each theorem are presented.
For example, you can input 'butterfly' to find the butterfly theorem or input 'circle and midpoint' to shorten the range.
If you are not sure how to use, please click Advance Search. And you can also click Example to see all the theorems we have collected.