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Academic discussion and doubt solving for: Logarithms, Set Theory, Matrices & Determinants, Permutation & Combination, Probability, Binomial Theorem
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I understood this but isnt a the radius, thus it should be positive?
The equation of the circle is
(x-h)^2 +(y-h)^2=r^2 , now as we have square of the radius , both positive and negative values are acceptable!!
In the given question you can put the value of a as +5 and -5 , you will get the same equation, thus option 4 is correct