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應用圓周公式：題 4
Author:
肖昆明
GeoGebra
New Resources
圓的基本性質
异形操场
活动三：应用性质
常见四边形是否是双心四边形
中华人民共和国国旗
Discover Resources
prism
半圓五角形滑動
四角錐體
定周长的正多边形面积变化规律（含圆）
arithmetic operation
Discover Topics
Symmetry
Derivative
Reflection
Sequences and Series
Piecewise Functions