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
,.
.
是的切線.····································· 5分
(2)是直徑,.
,
.··················································································· 6分
平分,.
.········································································ 8分
在中,.
在中,.
的長是1cm,的長是4cm.························································ 10分
【解析】略
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>>
湖北省互聯(lián)網(wǎng)違法和不良信息舉報平臺 | 網(wǎng)上有害信息舉報專區(qū) | 電信詐騙舉報專區(qū) | 涉歷史虛無主義有害信息舉報專區(qū) | 涉企侵權(quán)舉報專區(qū)
違法和不良信息舉報電話:027-86699610 舉報郵箱:58377363@163.com