(adsbygoogle = window.adsbygoogle || []).push({}); URGENT: Centre Point of a circle

1. The problem statement, all variables and given/known data

Find the center point of the circle shown in the diagram below and the radius of the circle.

http://img142.imageshack.us/img142/9469/45409301jg6.png [Broken]

The red dots have the following coordinates; (-17,0); (0,17); (31,0)

2. Relevant equations

[tex]\left( {x + a} \right)^2 + \left( {y + b} \right)^2 = r^2 [/tex]

3. The attempt at a solution

I can find the x-coordinate of the center of the circle finding the center point between (-17,0) and (31,0), and as the circle is symmetrical, this will be the x-coordinate of the center point. The value is 7, therefore the center of the circle is located (7,c) where c is some constant.

how do i find the value of the constant?

Many thanks,

unique_pavadrin

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# Homework Help: : Centre Point of a circle

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