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如图,BD是⊙O的切线,B为切点,连接DO与⊙O交于点C,AB为⊙O的直径,连接CA,若∠D=30°,⊙O的半径为4,则图中阴影部分的面积为 .
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.如图PB为⊙O.的切线B.为切点过B.作OP的垂线BA垂足为C.交⊙O.于点A.连接PAAO并延长
如图所示AB是⊙O的直径点C为⊙O外一点CACD是⊙O的切线AD为切点连接BDAD.若∠ACD=30
15°
30°
60°
75°
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如图所示AB是⊙O.的切线切点为B.AO交⊙O.于点C.过C.点的切线交AB于点D.若AD=3BDC
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2
1
0
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