Nobody knows how pi was discovered, But i think the folowing sc. are discoverd of pi . Archimedes Liu Hui Zu Chongzhi Aryabhata Madhava Ludolph van Ceulen Seki Takakazu Takebe Katahiro William Jones John Machin William Shanks John Wrench Chudnovsky brothers Yasumasa Kanada


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Actually nobody got o know that by whom was pi discovered .But we only know the no.s that are used for the solution in the circumference or the area of a circle and they are 3.14 and 22/7.
hope this helps u !!!!!!!!!!!!!!!!
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Nobody knows who  was the one who discovered pi