Question 1190570
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This discovery is attributed to Archimedes, a great ancient Greece mathematician, physicist and engineer   (c. 287  -  c. 212 BC).



He was first who discovered that in this situation


            volume of the cylinder is equal to the volume of the inscribed sphere PLUS the volume of the inscribed cone with the same base.



The legend says that Archimedes bequeathed to carve this formula on his grave.



About Archimedes, read this Wikipedia articles


https://en.wikipedia.org/wiki/Archimedes


https://simple.wikipedia.org/wiki/Archimedes