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和
平行，则实数
的值为 .天津理）如图,△ABC为圆的内接三角形, BD为圆的弦, 且BD//AC. 过点A 做圆的切线与DB的延长线交于点E, AD与BC交于点F. 若AB =" AC," AE =" 6," BD =" 5," 则线段CF的长为 .
)到直线ρsinθ=2的距离等于推荐套卷
天津理）如图,△ABC为圆的内接三角形, BD为圆的弦, 且BD//AC. 过点A 做圆的切线与DB的延长线交于点E, AD与BC交于点F. 若AB =" AC," AE =" 6," BD =" 5," 则线段CF的长为 .
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