
Algebra PreAlgebra and Basic Algebra Math Forum 
 LinkBack  Thread Tools  Display Modes 
April 7th, 2010, 08:27 PM  #1 
Newbie Joined: Apr 2010 Posts: 24 Thanks: 0  Circle equation
I have to find the equation of the tangent to the circle with equation x^2 + y^2 = 8 at the point (2,2) I'm just not sure how to use the point to form the equation, please help and in advance many thanks for your time and effort. 
April 8th, 2010, 04:46 AM  #2 
Senior Member Joined: Feb 2010 Posts: 706 Thanks: 141  Re: Circle equation
One of the standard forms for a straight line is the pointslope form. To use this form you need to know a point on the line and the slope of the line. You have a point. To get the slope, notice where the point (2,2) is located. You should be able to get a slope for a radius of the circle and from that you can get the slope of the line you want. MrTwhs 

Tags 
circle, equation 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Equation of a Circle  bilano99  Algebra  8  May 16th, 2013 08:01 AM 
Equation of a Circle  bilano99  Algebra  3  May 14th, 2013 07:36 PM 
Equation of a circle?  brian890  Algebra  6  December 16th, 2011 07:11 PM 
the equation of a circle  hailua  Algebra  1  April 28th, 2010 03:12 AM 
Circle equation ..right  Sean  Algebra  1  January 9th, 2007 02:50 PM 