DSE Circle-ACT05A Exterior Angle of a Cyclic Quadrilateral

作者：
MrWat@SFCC(HK)
主題：
角度, 圓
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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