03扇形03認識分數圓心的扇形(是非01)

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03扇形03認識分數圓心的扇形(是非01)

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(1) 圓對摺後就是圓，再對摺後就是圓。

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(2) 圓扇形的圓心角是60度。

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(3) 圓扇形的圓心角是72度。

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(4) 所有圓的扇形面積都一樣大。

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