第七章 圆
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第七章 圆. 第一节 圆. 例 1. (天津 2002 中考试题). 已知 AB 、 CD 是⊙ O 的两条直径,. 则四边形 ACBD 一定是( ). ( A )等腰梯形. ( B )菱形. ( C )矩形. ( D )正方形. C. A. B. O. D. 例 2. 如图 : 已知等腰直角三角形 ABC,. 试取斜边 AB 上的一点为圆心画圆,. 使点 A 、 B 、 C 分别在所画的圆内、圆外和圆上.. 例 3. 判断题. ( 1 )直径是弦( ) ;. ( 2 )弦是直径( ) ;. ( 3 )半圆是弧( ) ;.
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第七章 圆
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