What is the radius of the circle passing through the point (2, 4) and having centre at the intersection of the lines x-y=4 and 2x+3y+7=0?

NDA 2016 Mathematics question

What is the radius of the circle passing through the point and having centre at the intersection of the lines and ?

Answer: (D)

From in the second line: , ; the centre

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Question ID VK-028504