exam Maths Puzzle Numerical Ability

((x^2-y^2)/2x)/((x+y)/x^2)

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I do not understand the steps to solve the proofs
I understand how to get the "Given" and the "Prove" not the steps in between
could you please do step by step on how to get the
Determine the radius of the circle, given its centre and a point on its circumfrence. Round the radius to the nearest tenth, if necessary.

center (1,1) point (-2,1)