Type the parallelogram you would like to test in the place given to answer your question. You can pick from the three special parallelograms (square, rhombus, and rectangle). Type accurately and don't use capital letters or spaces. The parallelogram you have typed will then appear. by changing the sliders you can see how the other values change and prove theorems. To change a parallelogram simply press the green flag again.
Sorry for the bugs and inconveniences. I will try to improve it in the future.
