Here you can find some tutorials to help you to create circle, triangle and etc

Videos

Circle

https://youtu.be/EqCaKbq_AG8

Rectangle

https://www.youtube.com/watch?v=t3-QM2daH0o&index=1&list=PLITakOESY-2x__60pK3d1E4mQt2NJLGgo

Triangle

https://www.youtube.com/watch?v=g6-xAI6bWms&list=PLITakOESY-2yvF2sKHWJHxiP-Ph7unBHk&index=5

(until minute 1.04)

Basic for our worksheets

How put a picture to the GeoGebra worksheet

https://www.youtube.com/watch?v=CliqjfWFMlU&list=PLITakOESY-2ySi8HW9-bUWioCubl6VbLm&index=4

How put the GeoGebra worksheets to the text(or somewhere else) documents

https://www.youtube.com/watch?v=f7KKo38RZ9g&list=PLITakOESY-2w_2Vwej8zFCUMBy1S3zKd2&index=7