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ICSE Class X Math 2013 Paper

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ABA B is a diameter of a circle with centre C=C= (−2,5)(-2,5) . If A=(3,−7)A=(3,-7) . Find:
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Question : 10 of 46
Marks: +1, -0
The length of radius ACA C
Solution:  
The length of radius ACA C
  =(−2−3)2+(5+7)2\;=\sqrt{(-2-3)^2+(5+7)^2}
  =(−5)2+(12)2\;=\sqrt{(-5)^2+(12)^2}
  =25+144\;=\sqrt{25+144}
  =169\;=\sqrt{169}
  =13.\;=13 .
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