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BdMO National Primary 2019#8

Posted: Thu Mar 14, 2019 10:49 am
by samiul_samin
Screenshot_2019-03-12-22-40-02-1.png
Screenshot_2019-03-12-22-40-02-1.png (30.42 KiB) Viewed 268 times
In the figure,the small and big circle have a radius of $1$ and $3$ respectively.If the small circle revolves round the big circle according to the figure left to right.What portion of the circumference of the big circle it will cover?