State theorem of-
1- parallel axis
2- perpendicular axis.
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https://www.meritnation.com/ask-answer/question/state-perpendicular-axis-theorum-paralell-axis-theorum/system-of-particles-and-rotational-motion/3645281
https://www.meritnation.com/ask-answer/question/state-perpendicular-axis-theorum-paralell-axis-theorum/system-of-particles-and-rotational-motion/3645281