Angle subtended by an arc of a circle at the centre.

主題：圓

The angle subtended by an arc of a circle at the centre of the circle has a relationship with the angle subtended by the same arc at any point on the circumference? Explore and find the relation.

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Types of Triangles
圓的半徑和周界之關係_李樂雯
Proof Pythagoreon
Eureka #12 Additional Problem 1
Circle Theorem 4

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反射
數
加法
分段函數
曲線描繪

Angle subtended by an arc of a circle at the centre.

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