Investigate chord and perpendicular bisector

Autor:Angela Ellis, GeoGebra Materials Team

Below you see Circle A with Chord CD. The red line is the perpendicular bisector of Chord CD. Move the blue points to help you answer the question below.

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兩位數的位值
函數的奇偶性
Prism Drawn in 2-Point Perspective

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共角定理 (English name?)
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Angle between tangent and chord
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