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DSE Circle-ACT05A Exterior Angle of a Cyclic Quadrilateral

Auteur :MrWat@SFCC(HK)
Thème :Angles, Cercle
1. You can change the cyclic quadrilateral ABCD by moving the points A, B, C and D. 2. Where is in this figure? Try to describe in different ways. 3. How to find quickly?

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