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圆与圆复习

圆与圆复习. 1 .两圆相交,公共弦长为 16cm ,两圆半径分别为 10cm 和 17cm ,则它们的圆心距为 cm. 2 .如图,⊙ O 与⊙ N 和⊙ P 相外切, ONP 在同一直线上,且半径均为 15 , AG 与⊙ P 相切于 G ,与⊙ N 交于 E 、 F ,则 EF=. 3 .如图,两圆⊙ O 1 和⊙ O 2 相交于 A 、 B 两点, DBC 和 EAO 2 都是直线,且∠ AO 2 C=140 º ,那么∠ E= 。.

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圆与圆复习

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  1. 圆与圆复习

  2. 1.两圆相交,公共弦长为16cm,两圆半径分别为10cm和17cm,则它们的圆心距为cm.1.两圆相交,公共弦长为16cm,两圆半径分别为10cm和17cm,则它们的圆心距为cm. 2.如图,⊙O与⊙N和⊙P相外切,ONP在同一直线上,且半径均为15,AG与⊙P相切于G,与⊙N交于E、F,则EF=.

  3. 3.如图,两圆⊙O1和⊙O2相交于A、B两点,DBC和EAO2都是直线,且∠AO2C=140º,那么∠E=。

  4. 4、如图,⊙O2过⊙O1的圆心O1且与⊙O1内切于点P,弦AB切⊙O2于点C,PA、PB分别与⊙O2交于D、E两点,延长PC交⊙O1于点F,4、如图,⊙O2过⊙O1的圆心O1且与⊙O1内切于点P,弦AB切⊙O2于点C,PA、PB分别与⊙O2交于D、E两点,延长PC交⊙O1于点F, 求证:(1)BC2=BE·BP; (2)∠1=∠2;CF2=BE·AP。

  5. 5.如图,⊙O与⊙O'相交于A、B两点,过点A作⊙O'的切线交⊙O于点C。(1)求证:PA·PE=PC·PF;(2)求证:PE2/PC2=PF/PB;5.如图,⊙O与⊙O'相交于A、B两点,过点A作⊙O'的切线交⊙O于点C。(1)求证:PA·PE=PC·PF;(2)求证:PE2/PC2=PF/PB;

  6. 6、如图,△ABC中,AB=5,AC=4,BC=3,⊙O1是△ABC的内切圆,⊙O2与⊙O1外切,且与边AB、BC相切,求⊙O2的半径。6、如图,△ABC中,AB=5,AC=4,BC=3,⊙O1是△ABC的内切圆,⊙O2与⊙O1外切,且与边AB、BC相切,求⊙O2的半径。

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