454141017 發(fā)表于 2018-5-8 09:29
同弧所對(duì)應(yīng)的圓周角相等
隨風(fēng)而逝002 發(fā)表于 2018-5-9 15:33
過A點(diǎn)做一條直線與AB成54°,相交于AB的中垂線與O點(diǎn),然后以O(shè)點(diǎn)為圓心畫圓經(jīng)過AB,那么與A1B1直線相交點(diǎn)C就 ...
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