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圆内弦（迭代）
Author:
dhc987
GeoGebra
New Resources
sanjiaohanshu
算柱 (兩位數)
四邊形的特性
找出對稱軸
兩組對邊相等和有直角的四邊形
Discover Resources
Trigonometric Ratios: Cosine & Tangent 三角比：餘弦和正切
Example 1
數學操作課程_20150920
圖D
內心
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Incircle or Inscribed Circle
Root
Circumcircle or Circumscribed Circle
Sine
Hyperbola