curves and circles amath - Singapore Forums by SGClub.com
Singapore Forums by SGClub.com
Sitemap Contact Us FAQ Singapore Forums by SGClub.com
Home Photos Member List Register Mark Forums Read  
Go Back Home > Lifestyle > School Life > Math Help » curves and circles amath

Why aren't you a member of SGClub.com yet??

» Join 130,000+ other members in chatting.
» Make lots of new friends here.
» Keep up-to-date with current events.
» Participate in Club outings.
» Download lots of Free Stuff!

Registration just takes 2mins and is absolutely free so join our community today!

I Want to Choose my Own Personal Nickname Now!


Reply
 
LinkBack Thread Tools Display Modes
Old 29th November 2012, 06:27 PM   #1 (permalink)
New SGClubber
snowmine is on a distinguished road

 
Posts: 23
Join Date: Nov 2012
Likes: 17
Liked 3 Times in 2 Posts
Gender:

curves and circles amath

Another circle C2, pasess through the origin and touches the vertical line x-8=0 at the point A(8,4). Find the equation of the circle C2, in the form x^2+y^2+hx+ky+c

may I know how to do this question.

Sponsors:
snowmine is offline  
Add to snowmine's Reputation Reply With Quote
Old 29th November 2012, 06:48 PM   #2 (permalink)
Honesty is a virtue~
Tetrahedron is a jewel in the roughTetrahedron is a jewel in the rough

 
Tetrahedron's Avatar
 
Posts: 1,519
Join Date: Sep 2010
Likes: 16
Liked 156 Times in 111 Posts
Gender:

Re: curves and circles amath

Originally Posted by snowmine View Post
Another circle C2, pasess through the origin and touches the vertical line x-8=0 at the point A(8,4). Find the equation of the circle C2, in the form x^2+y^2+hx+ky+c

may I know how to do this question.
Let the co-ordinates of the center C be (X,Y)

X˛+Y˛=(X-8)˛+(Y-4)˛ -(1)
As the line x=8 is a tangent of the circle at (8,4), AC is perpendicular to x=8.
Thus, AC must be a horizontal line with y=4. Thus, Y=4.
Substituting Y=4
X˛+16=(X-8)˛+0
X˛+16=X˛-16X+64
X=4
Radius = (8-4) = 4

Hence, formula: (x-4)˛+(y-4)˛=16

__________________
Currently just a wanderer...

Last edited by Tetrahedron; 29th November 2012 at 11:46 PM.
Tetrahedron is offline   Add to Tetrahedron's Reputation Reply With Quote
Old 29th November 2012, 07:12 PM   #3 (permalink)
New SGClubber
snowmine is on a distinguished road

 
Posts: 23
Join Date: Nov 2012
Likes: 17
Liked 3 Times in 2 Posts
Gender:

Re: curves and circles amath

Thanks tetrahedron

But I don't understand how did you get x^2+y^2 = (x-8)^2+(y-4)^2

snowmine is offline   Add to snowmine's Reputation Reply With Quote
Old 29th November 2012, 11:41 PM   #4 (permalink)
Honesty is a virtue~
Tetrahedron is a jewel in the roughTetrahedron is a jewel in the rough

 
Tetrahedron's Avatar
 
Posts: 1,519
Join Date: Sep 2010
Likes: 16
Liked 156 Times in 111 Posts
Gender:

Re: curves and circles amath

Originally Posted by snowmine View Post
Thanks tetrahedron

But I don't understand how did you get x^2+y^2 = (x-8)^2+(y-4)^2
Consider the radius of the circle.

__________________
Currently just a wanderer...
Tetrahedron is offline   Add to Tetrahedron's Reputation Reply With Quote
Old 30th November 2012, 10:44 AM   #5 (permalink)
New SGClubber
snowmine is on a distinguished road

 
Posts: 23
Join Date: Nov 2012
Likes: 17
Liked 3 Times in 2 Posts
Gender:

Re: curves and circles amath

Ohhhh I see! I got it! Thank you!!!

snowmine is offline   Add to snowmine's Reputation Reply With Quote
Old 30th November 2012, 10:49 AM   #6 (permalink)
Honesty is a virtue~
Tetrahedron is a jewel in the roughTetrahedron is a jewel in the rough

 
Tetrahedron's Avatar
 
Posts: 1,519
Join Date: Sep 2010
Likes: 16
Liked 156 Times in 111 Posts
Gender:


Originally Posted by snowmine View Post
Ohhhh I see! I got it! Thank you!!!
I think I made a careless mistake somewhere. If you understood the approach you should be able to find it.

__________________
Currently just a wanderer...
Tetrahedron is offline   Add to Tetrahedron's Reputation Reply With Quote
Old 30th November 2012, 01:44 PM   #7 (permalink)
New SGClubber
snowmine is on a distinguished road

 
Posts: 23
Join Date: Nov 2012
Likes: 17
Liked 3 Times in 2 Posts
Gender:

Re: curves and circles amath

Haha. Yea. I managed to find the careless mistake. It's all right though. Thanks a lot!

snowmine is offline   Add to snowmine's Reputation Reply With Quote
Reply

Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Private O-Level Amath/ JC H2 Maths w/o O level Amath nutcase School Life 19 19th November 2012 08:38 AM
Loose Women's Andrea McLean shows off her curves in near naked photo shoot fgfmse Movie/TV Chat & News 0 1st December 2011 07:16 PM
Lee Young-ae flaunts new, sexy curves *StarDust* Korean Interest 1 5th July 2011 09:32 AM
Designer Sofa with Sexy Curves (Italian Design) Nickname General Merchandise 0 17th April 2009 09:06 PM
BLIND SPOTS, CURVES, DARKNESS... CRASH KaLeen International & Singapore News 3 19th October 2007 12:11 AM

» Sponsors
Watch Free Movies Online
Celebrity Gossip
Food Delivery

» Facebook Fans
» What's Going On?
Title, Username, & Date
Repost comment.
[Maid abuse] Singapore is a very evil and lawless country. There is broad daylight i
Stupid court of appeal gives red light running driver who hit pedestrian 15% discount
Mum's Kitchen Catering and Cherish Delights get licences suspended after nearly 40 people...
[PMD-pedestrian rules] Singapore Court judges are high handed and biased or court rep
Post anything random on this thread.
Ritter Sport chocolate recalled due to undeclared allergen
Aoki Hagane no Arpeggio: Ars Nova
I really hate my mother!!!
Transcend RDF9K2 All-in-One Card Reader
Transcend ESD250C, a portable SSD that’s super classy
How PAP exploited racial differences to impose FASCIST rule over Singapore.
Up to S$7250 of government $ misused for buying each vote in Singapore?
Funky Fields organic vegan spreadable recalled due to 'undisclosed allergen'
100 hawksbill turtles released into the sea after rare hatching on Sentosa
Inspirational Songs
MOH, SFA investigating after 18 typhoid fever cases in 3 weeks
By militarily invading Hong Kong, Xi Jingping is setting in motion, the wheels of nuc
Deng XiaoPing original vision for HKG- China reunification was for the two to unite a
HSA warns against three products
Featured Photos
by marisoljames322
· · ·
Member Galleries
20359 photos
13619 comments
by marisoljames322
· · ·
Member Galleries
20359 photos
13619 comments
by pdsubbu
· · ·
Member Galleries
20359 photos
13619 comments
by Vikas Dhar
· · ·
Photography
35 photos
36 comments
by aaudreygan
· · ·
Guy Photos
1581 photos
946 comments
by aaudreygan
· · ·
Girl Photos
4351 photos
28608 comments
by a8paris
· · ·
Guy Photos
1581 photos
946 comments
by a8paris
· · ·
Guy Photos
1581 photos
946 comments
by aaricia
· · ·
Girl Photos
4351 photos
28608 comments
by aaricia
· · ·
Girl Photos
4351 photos
28608 comments

 

All times are GMT +8. The time now is 05:51 PM.


Powered by vBulletin
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Copyright© 2004-2013 SGClub.com. All rights reserved.