Draw a circle with centre 
. 
is a right angled triangle inscribed in the circle. The right angle of is at vertex 
. The length of the hypotenuse of is 
, the length of the other sides are in the ratio 
. Draw a tangent line which makes a point of contact with the circle at the vertex 
of the right angle triangle. The point 
is the intersection of the tangent and a line that bisects the 
. Calculate the distance 
of the point from the centre of the circle .
