如何证明：过三角形abc的三个顶点作其外接圆切线，分别和各对边所在直线交于一点，则三交点共线？ 知乎 Sketch Coloring Page

如何证明：过三角形abc的三个顶点作其外接圆切线，分别和各对边所在直线交于一点，则三交点共线？ 知乎 Template

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tomski如何证明：过三角形abc的三个顶点作其外接圆切线，分别和各对边所在直线交于一点，则三交点共线？ 知乎 coloring

如何证明：过三角形ABC的三个顶点作其外接圆切线，分别和各对边所在直线交于一点，则三交点共线？ 知乎 sketch template

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有三角形ABC，其内部包含一条端点为B、C的光�凸曲线，如何证明曲线的长度小于三角形剩余两边之和？ 知乎 sketch template

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如图�分别以直角三角形ABC三边为直径�外作三个半圆其面积分别用S1S2S3表示则不难证明S1=S2 S3．1如图�分别以直角 sketch template

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9．已知等边三角形ABCAB=12以AB为直径的半圆与BC边交于点D过点D作DF⊥AC垂足为F过点F作FG⊥AB垂足为G连接GD sketch template

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百度教育 sketch template

如图三角形ABC的三条边长都是2厘米分别以线段ABBCCA的中点DEF为圆心2厘米为直径画半圆．1求阴影部分的�长．2求 sketch template

等边三角形ABC内接于⊙0连接OAOBOC延长AO分别交BC于点PBC于点D连接BDCD．1判断四边形BDCO是哪一种特殊 sketch template

等边三角形ABC内接于⊙0连接OAOBOC延长AO分别交BC于点PBC于点D连接BDCD．1判断四边形BDCO是哪一种特殊 sketch template

2．如图�分别以直角三角形ABC三边为直径�外作三个半圆其面积分别用S1S2S3表示则不难证明S1=S2 S3 1 如图� sketch template

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19．如图已知三个同心圆等边三角形ABC的三个项点分别在三个圆上请你先把这个三角形绕着点O顺时针旋转120度再说明旋转的结果——青夏 sketch template

三角形外接圆半径公式有哪些百度经验 sketch template

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