Question 732003
Right triangle ABC is inscribed in a quarter of a circle. What is the length of AC?

http://tinypic.com/r/oghnwg/6 (the diagram)
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Using the fact that the products of chord segments within a circle are equal:
BC*BC = 5*(d-5) = 75
AB = 5
{{{BC = sqrt(75 + 5^2) = 10}}}