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liang yuan wai gong qie xian chang de yi ge xing zhi ji ying yong
Author(s): 
Pages: 42-42
Year: Issue:  4
Journal: ZHONGXUE SHUXUE ZAZHI(CHUZHONG BAN)

Abstract: 知道两个圆的半径及圆心距就可以求出这两个圆的外公切线的长。如图1,圆O1和圆O2的半径分别为r1和r2,圆心距O1 O2= d,两圆的一条外公切线为PQ,P、Q为切点,则不难求得:PQ2= d2-( r2-r1)2,即PQ = d2-( r2-r1)2。
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