ncry.net
当前位置:首页 >> (2014?崇安区一模)如图,AB为⊙O的直径,点C在⊙O上,延长BC至点D,使DC=CB,延长DA... >>

(2014?崇安区一模)如图,AB为⊙O的直径,点C在⊙O上,延长BC至点D,使DC=CB,延长DA...

(1)证明:∵AB是⊙O的直径,∴∠ACB=90°,又∵DC=CB,∴AC垂直平分DB,∴AB=AD

网站首页 | 网站地图
All rights reserved Powered by www.ncry.net
copyright ©right 2010-2021。
内容来自网络,如有侵犯请联系客服。zhit325@qq.com