Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » Math Topics » alt.math.undergrad.independent

Topic: need help for the circle -_-
Replies: 8   Last Post: Jul 9, 2013 9:27 AM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Z

Posts: 17
From: Artic
Registered: 6/22/13
Re: need help for the circle -_-
Posted: Jun 22, 2013 9:54 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

Hey,

Tangent to the y-axis means that it just touches the y-axis. This is the equation of the circle you desire, (x+5)^2+(y+2)^2=25. You get this because you want the length of the segment that goes from the point (-5,-2) to the y-axis. This will end up being your radius. Notice (-5,-2) lies on the line y=-2, so you wish to use the distance formula or by simply just looking at it geometrically answer this, how many units do you need to add to -5 to get to 0.....5 right? And remember its always radius^2, hence the 25. Message me if anything is confusing.



Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.