圆为(x-2)^2 + (y-3)^2 = 1
A到圆心(2,3)距离为√10
首先点在圆外,切线存在
圆半径为1
所以切线长为3
自点A(-1,4)作圆X²+Y²-4X-6Y+12=0的切线,则切线长为?
自点A(-1,4)作圆X²+Y²-4X-6Y+12=0的切线,则切线长为?
数学人气：912 ℃时间：2020-01-27 07:48:10
优质解答
我来回答
类似推荐
猜你喜欢
- 1Who was the last student ___the classroom yesterday afternoon?
- 2一辆汽车一三十米每秒的速度从A地开往B地,然后立即返回,速度是二十米每秒.则汽车的往返的平均速度是
- 3已知a、b互为相反数,且a不等于b, c、d互为倒数,x的绝对值是4,求x的2次方—（a+b+cd）x +（a+b）的2012次方+（a/b）的2009的值,是多少啊,要算式,回答了给高分,急啊
- 4The story is about a man __plans to take a __to some places in __and is finding it very__because he
- 5一切物体在______________都有内能.温度越高,分子热运动_____________,物体的内能就__________________.
- 6苏教版小学六年级下册语文23课孔子游春预习
- 7用所给词的适当形式填空 I’m sorry I can’t afford ＿＿(buy) this dictionary.
- 81..饲养场养鸡1250只,比鸭的只数多25％,饲养场养鸭多少只?（方程解
- 9time is not enough for so much work .i'll ask ----(two)another to help us.
- 10He doesn't have any time to stay with me同义句