会英语的请回答 一道有关圆的问题a)THE vertical line x+2=o touches the circle at point A(-2,4) the circle passes though the origin O and the point B(7,1) find the equation of the circle b)write down the coordinates of the centre of the x

来源：学生作业帮助网 编辑：作业帮 时间：2024/11/25 03:35:53
会英语的请回答 一道有关圆的问题a)THE vertical line x+2=o touches the circle at point A(-2,4) the circle passes though the origin O and the point B(7,1) find the equation of the circle b)write down the coordinates of the centre of the x
xV_oT*WbŎk'q8RHDÞK1vj;4A{(2*:$6 ԗXMI- iR(O{;wu]}2y9><=;>|=<g_ޏEOٷ/~z[>1Q 4=zi lt|e!ȫY:+MrΊ:@EԶ2k: Ƥ?[RGITm7d-xM_[?(LutOf'*j"p5"\u,KEIlK{a@Mڋ *UOKmC]钡~F6.TZH54Vk7TyoD!䴫 pl<62>fțh,|hhhhzN/^U:>Eoᓖ؂їG~lޡ6-`/e;՗S Ί}v|[ϒd TWP8|R=Aſ:N^_ZMӥռ9{קYo=s%SL1:sԦgK1f;җ=&j6MPY`&:K^3> vQLi7 2rNVO

会英语的请回答 一道有关圆的问题a)THE vertical line x+2=o touches the circle at point A(-2,4) the circle passes though the origin O and the point B(7,1) find the equation of the circle b)write down the coordinates of the centre of the x
会英语的请回答 一道有关圆的问题
a)THE vertical line x+2=o touches the circle at point A(-2,4) the circle passes though the origin O and the point B(7,1) find the equation of the circle
b)write down the coordinates of the centre of the x^2+y^2-8x-4y+8=0
the line y=x cuts the circle at points A and B find the coordinates of M the midpoint of A and B

会英语的请回答 一道有关圆的问题a)THE vertical line x+2=o touches the circle at point A(-2,4) the circle passes though the origin O and the point B(7,1) find the equation of the circle b)write down the coordinates of the centre of the x
a)The vertical line x+2=0 touches the circle at point A(-2,4) ,the circle passes though the origin O and the point B(7,1) ,find the equation of the circle.
1)垂线x=-2与圆交于点A(-2,4),圆经过原点及点B(7,1),试写出圆的方程.
线段AO;BO的垂直平分线l1;l2即为圆心.
l1:x-2y+5=0
l2:14x+2y-50=0
O`(3,4)
r=|OO`|=5
圆的方程:(x-3)^2+(y-4)^2=25
b)write down the coordinates of the centre of the x^2+y^2-8x-4y+8=0
the line y=x cuts the circle at points A and B,find the coordinates of M the midpoint of A and B
2)写下圆x^2+y^2-8x-4y+8=0的圆心坐标
(x-4)^2+(y-2)^2=12
圆心坐标(4,2)
直线y=x与圆交于A,B两点,写出线段AB中点M的坐标.
如图:O`M是线段AB的垂直平分线
所以M(3,3)

a) set the equation of the circle as (x-a)^2+(y-b)^2=r^2
the circle passes though the origin O ==> a^2+b^2=r^2
A(-2,4) ==> (-2-a)^2+(4-b)^2=r^2 ==> a=2b-5
B(7,1) ==> (7-a)^2+(1-b)^2=r^2 ==...

全部展开

a) set the equation of the circle as (x-a)^2+(y-b)^2=r^2
the circle passes though the origin O ==> a^2+b^2=r^2
A(-2,4) ==> (-2-a)^2+(4-b)^2=r^2 ==> a=2b-5
B(7,1) ==> (7-a)^2+(1-b)^2=r^2 ==>
==> a=3, b=4, r=5
==> the equation of the circle is (x-3)^2+(y-4)^2=25
b) x^2+y^2-8x-4y+8=0
(x-4)^2 + (y-2)^2 = 12
The centre P(4,2)
y=x, (x-4)^2 + (y-2)^2 = 12
x1=y1=(3+sqrt(5))/2
x2=y2=(3-sqrt(5))/2
midpoint M(3/2,3/2)

收起

会英语的请回答 一道有关圆的问题a)THE vertical line x+2=o touches the circle at point A(-2,4) the circle passes though the origin O and the point B(7,1) find the equation of the circle b)write down the coordinates of the centre of the x 英语中有 th 的字母读时是否要伸舌头请回答是还是不是 与音标有关 如果你是导游,你会怎么介绍西湖?请用英语回答我的问题 . 一道 有关集合的问题 一道有关风牛病的问题. Say something about the 16th Asian Games.请用英语回答问题. 北京2008年奥运会口号和吉祥物的设计取得的巨大成功说明了什么这是九年级社会的一道问题,请根据有关内容回答, 请用英语回答我的问题”英语怎么说 th的发音规律快,有关英语的 一个有关Honesty的问题!请用英语回答,1.the importance of honesty2.solutions to the problem of dishonesty3.Expectations请分别用英语阐述, 有关平面直角坐标系里的象限的问题!如图：还有会做这个题目的吗？请回答详细点。谢谢！1 请尽快回答我的问题用英语怎么说 请回答我的问题用英语怎么说 请回答我的问题. 用英语怎么说? 请回答我的问题 用英语怎么说 请回答下列的英语完形填空问题. 一道有关《金色的鱼钩》的阅读题目问题:老班长怎样了?为什么会这样? 一道初三数学题有关圆的问题在图上.