03扇形02認識圓心角(是非01)

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03扇形02認識圓心角(是非01)

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(1) 如下圖，箭頭所指的範圍是圓心角。

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Captionless Image

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否

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(2) 扇形的圓心角度數不可大於180度。

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(3) 180度的角，叫作周角。

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