如圖,四邊形內(nèi)接于⊙O,是⊙O的直徑,,垂足為平分

(1)求證:是⊙O的切線;

(2)若,求的長.

 

解:(1)證明:連接

平分,

.························································································ 3分

,

的切線.····································· 5分

(2)是直徑,

,

.··················································································· 6分

平分

.········································································ 8分

中,

中,

的長是1cm,的長是4cm.························································ 10分

解析:略

 

練習(xí)冊系列答案
相關(guān)習(xí)題

科目:初中數(shù)學(xué) 來源: 題型:

如圖,四邊形內(nèi)接于⊙O,是⊙O的直徑,,垂足為,平分

(1)求證:是⊙O的切線;
(2)若,求的長.

查看答案和解析>>

科目:初中數(shù)學(xué) 來源:2011年廣東省深圳市南山區(qū)初二期末數(shù)學(xué)卷 題型:解答題

如圖,四邊形內(nèi)接于⊙O,是⊙O的直徑,,垂足為,平分

(1)求證:是⊙O的切線;
(2)若,求的長.

查看答案和解析>>

科目:初中數(shù)學(xué) 來源:2011年廣東省深圳市南山區(qū)初二期末數(shù)學(xué)卷 題型:解答題

如圖,四邊形內(nèi)接于⊙O,是⊙O的直徑,,垂足為平分

(1)求證:是⊙O的切線;

(2)若,求的長.

 

查看答案和解析>>

科目:初中數(shù)學(xué) 來源:2010-2011學(xué)年廣東省考數(shù)學(xué)模擬試卷(一) 題型:解答題

如圖,四邊形內(nèi)接于⊙O,是⊙O的直徑,,垂足為,平分

(1)求證:是⊙O的切線;

(2)若,求的長.

 

查看答案和解析>>

同步練習(xí)冊答案