無
*注意事項(xiàng):
如圖,已知圓心角∠AOB的度數(shù)為100°,則圓周角∠ACB的度數(shù)是( )
(1)畫出△ABC關(guān)于y軸對(duì)稱的△A1B1C1 , 并寫出點(diǎn)B的對(duì)應(yīng)點(diǎn)B1的坐標(biāo); (2)畫出△ABC繞點(diǎn)A按順時(shí)針旋轉(zhuǎn)90°后的△AB2C2 , 并寫出點(diǎn)C的對(duì)應(yīng)點(diǎn)C2的坐標(biāo).
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