Google Classroom GeoGebra Klaslokaal Szögek
Forrás: https://www.mathspad.co.uk/teach/circleTheorems.php
Forrás: https://socratic.org/questions/a-b-and-c-are-the-3-points-on-the-circle-and-o-is-the-centre-of-the-circle-if-oa#552809
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