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“deardear77”:★在同圓或等圓中相等的圓周角所對的弧、弦相(相等)★一個圓的圓心角,分成360份,每一份的圓心角就是一度.★一個圓的圓周也分成360份,每一份(一段弧)也是一度(弧)∴圓心角所對的弧,度數相等….
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