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July 18th, 2017, 01:10 AM  #1 
Newbie Joined: Jul 2017 From: Australia Posts: 3 Thanks: 0  NO idea how to do this Circle problem
Could I get some help with this question? The question just asks for the length of RS, which I don't know how to calculate. Help with solving the question would be greatly appreciated! Last edited by skipjack; July 18th, 2017 at 03:41 AM. 
July 18th, 2017, 03:43 AM  #2 
Senior Member Joined: Oct 2009 Posts: 142 Thanks: 60 
Do you get to use analytic geometry? I.e. equation of a circle? Or do you have to use purely synthetic means?

July 18th, 2017, 03:48 AM  #3 
Global Moderator Joined: Dec 2006 Posts: 18,034 Thanks: 1393 
By symmetry, P has coordinates (6, 0). By Pythagoras, the radius of each circle is 5. Hence R has coordinates (1, 0) and S has coordinates (5, 0), and so RS = 4. Last edited by skipjack; July 18th, 2017 at 03:50 AM. 
July 18th, 2017, 03:59 AM  #4 
Senior Member Joined: Oct 2009 Posts: 142 Thanks: 60  

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