www.youtube.com/watch?v=3lMQTWthI1o&list=PLlQgBpv1udkKS8PewrmCYbr-FTkCr2SC3
www.youtube.com/watch?v=vtCQPzO5DrU&list=PLlQgBpv1udkI2dnIt8n-J4_etGO2XQDhb
www.youtube.com/watch?v=JU0MMQr6r-I
www.youtube.com/watch?v=b9uu5nhQsIU
www.youtube.com/watch?v=ViE36x7XicQ
www.youtube.com/watch?v=jW8BodvSGIg trojůhelník
www.youtube.com/watch?v=mp-RQtGiQBA
www.youtube.com/watch?v=NjFOEL4cyMU
www.youtube.com/watch?v=fe16B8Hv3gE obsah
www.youtube.com/watch?v=r4WjAKknLwA
www.youtube.com/watch?v=0nRKv28A2yU
www.youtube.com/watch?v=6jyyRzCuL_o
www.youtube.com/watch?v=f8RWpx8O51c
www.youtube.com/watch?v=ruR4HFfhEg0 obvod kruhu
www.youtube.com/watch?v=OBW0QF-ZwQM obvod kruhu Špilka
www.youtube.com/watch?v=So5v2saines obvod válce
www.youtube.com/watch?v=0ii4_-GIh5Q
www.youtube.com/watch?v=YNjHf1vTB1Y kruh, kružnice
www.youtube.com/watch?v=uo6xrlkgUCs pytVěta
www.youtube.com/watch?v=C2iIdPb8A9s
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