https://www.youtube.com/watch?v=AqRVtHucS7g
https://www.cbsetuts.com/ncert-class-9-maths-lab-manual-verify-opposite-angles-cyclic-quadrilateral/
https://www.youtube.com/watch?v=jC72Vmyu5i4&t=99s
https://www.aplustopper.com/math-labs-activity-cyclic-quadrilateral/