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如图,⊙O的半径为6,点A、B、C在⊙O上,且∠ACB=45°,则弦AB的长是 ...
如图,⊙O的半径为6,点A、B、C在⊙O上,且∠ACB=45°,则弦AB的长是
.
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如图所示,P是菱形ABCD的对角线AC上一动点,过P垂直于AC的直线交菱形ABCD的边于M、N两点,设AC=2,BD=1,AP=x,则△AMN的面积为y,则y关于x的函数图象的大致形状是( )
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A.
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B.
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C.
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D.
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如图.在梯形ABCD中,AB∥DC,AD=DC=CB,若∠ABD=25°,则∠BAD的大小是( )
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A.40°
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C.50°
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B.
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C.
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D.
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