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第七章 圆

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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  1. 第七章 圆 第一节 圆

  2. 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

  3. 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.

  4. 例3 判断题 (1)直径是弦(); (2)弦是直径(); (3)半圆是弧(); (4)弧是半圆(); (5)长度相等的两段弧是等弧(); (6)等弧的长度相等().

  5. A D B O C 例4 已知: 如图, 两同心圆的直径AC、BD相交于O点. 求证:AB=CD.

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