(贵阳专用)2019中考数学总复习第1部分教材同步复习第六章圆课时21圆及其相关性质真题精练.doc

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1第一部分 第六章 课时 21命题点 1 垂径定理的相关计算1(2016贵阳)如图,已知 O 的半径为 6 cm,弦 AB 的长为 8 cm, P 是 AB 延长线上一点, BP2 cm,则 tan OPA 的值是_ _.53命题点 2 与圆周角定理有关的计算2(2014贵阳)如图, AB 是 O 的直径,点 D 在 O 上, BOD130, AC OD 交 O 于点 C,连接 BC,则 B_40_度命题点 3 圆内接多边形的性质3(2017贵阳)如图,正六边形 ABCDEF 内接于 O, O 的半径为 6,则这个正六边形的边心距 OM 的长为_3 _.34(2015贵阳)如图,四边形 ABCD 是 O 的内接正方形若正方形的面积等于 4,则 O 的面积等于_2_.

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