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December 18, 2014

December 18, 2014

Posted by **Matt** on Saturday, March 23, 2013 at 11:13pm.

- Math -
**Reiny**, Sunday, March 24, 2013 at 1:01amI will make the assumption that P is on the circle

then if the centre is the origin , called O

then slope PO = -1/slope PA

y/x = -1/(y/(x-25) )

y/x = (25-x)/y

y^2 = 25x - x^2

but y^2 = 400 - x^2

400-x^2 = 25x - x^2

25x = 400

x = 16

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