Mathematics · 2021
JEE Main · 17 March 2021, Shift 1 · Q74
The line 2 x-y+1=0 is a tangent to the circle at the point (2,5) and the centre of the circle lies on x-2 y=4. Then, the radius of the circle is:
The line $\displaystyle 2 x-y+1=0$ is a tangent to the circle at the point $\displaystyle (2,5)$ and the centre of the circle lies on $\displaystyle x-2 y=4$. Then, the radius of the circle is :
Official answer
(4)
$\displaystyle 3 \sqrt{5}$
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JEE Main 2021 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.