Mathematics · 2018
JEE Main · 15 April 2018, Shift 2 · Q80
The tangent to the circle C_1: x^2+y^2-2 x-1=0 at the point (2,1) cuts off a chord of length 4 from a circle C_2 whose centre is (3, -2). The radius…
The tangent to the circle $\displaystyle \mathrm{C}_1: x^2+y^2-2 x-1=0$ at the point $\displaystyle (2,1)$ cuts off a chord of length $\displaystyle 4$ from a circle $\displaystyle \mathrm{C}_2$ whose centre is $\displaystyle (3, -2)$. The radius of $\displaystyle \mathrm{C}_2$ is :
Official answer
(4)
$\displaystyle \sqrt{6}$
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JEE Main 2018 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.