Mathematics · 2021
JEE Main · 18 March 2021, Shift 2 · Q67
Let the centroid of an equilateral triangle ABC be at the origin. Let one of the sides of the equilateral triangle be along the straight line x+y=3.…
Let the centroid of an equilateral triangle ABC be at the origin. Let one of the sides of the equilateral triangle be along the straight line $\displaystyle x+y=3$. If R and r be the radius of circumcircle and incircle respectively of $\displaystyle \Delta \mathrm{ABC}$, then $\displaystyle (\mathrm{R}+\mathrm{r})$ is equal to:
Official answer
(2)
$\displaystyle \frac{9}{\sqrt{2}}$
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JEE Main 2021 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.