# P.o.t.M. #1-Nov 2018 solution (a) The diagram at right (not to scale) shows the unique circle passing through $$\left( {1,0} \right)$$, $$\left( {0,18} \right)$$ and $$\left( {0,0} \right)$$. These points are the vertices of a right triangle (shaded yellow). The hypotenuse of this right triangle must be the diameter of the circle and its midpoint $$\left( {\frac{1}{2},9} \right)$$ is the centre of the circle. The diameter d of the circle can be computed using Pythagoras: $${d^2} = {1^2} + {18^2}\;\;\;\; \Rightarrow \;\;\;\;d = \sqrt {325}$$(b) The diagram below (to scale) shows...

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