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如图,AB是半圆的直径,点C是弧AB的中点,点E是弧AC的中点,连接EB,CA交...
如图,AB是半圆的直径,点C是弧AB的中点,点E是弧AC的中点,连接EB,CA交于点F,则
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=( )
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A.
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B.
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C.1-
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D.
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“赵爽弦图”是四个全等的直角三角形与中间一个小正方形拼成的大正方形.如图,是一“赵爽弦图”飞镖板,其直角三角形的两条直角边的长分别是2和4.小明同学距飞镖板一定距离向飞镖板投掷飞镖(假设投掷的飞镖均扎在飞镖板上),则投掷一次飞镖扎在中间小正方形区域(含边线)的概率是( )
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D.
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B.
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C.
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