exam Maths Puzzle Numerical Ability

I am trying to solve problem 10 on page 419. I do not understand how to find the base, when the area is already given in a triangle

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i need urgent halp on this question please x^2+1/x^2-2-3x+3/x thanks find the length of a radius of the circle x^2+y^2-4x-6y-5=0