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C1 Circle question

A(9,8), B(5,0) and C(3,1) are three points

I've shown that AB and BC are perpendicular and I've found the equation of the circle, it is (x−6)2+(y−4.5)2=85over4(x-6)^2+(y-4.5)^2=85 over 4 and i've shown that B lies on the circle

but now it is asking me to find the coordinates of D when BD is a diameter of the circle...I do not get this part..
(edited 12 years ago)
So you know the coordinates of the centre of the circle (Let's call it O) and you know B. BO is a radius and O is the midpoint of BD.

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