Lambert had proved in 1761 that π was irrational but this was not enough to prove the impossibility of squaring the circle with ruler and compass since certain algebraic numbers can be constructed with ruler and compass.
Lambert had proved sa 1761 na π ay hindi makatwiran ngunit ito ay hindi sapat upang patunayan ang ikaaari ng squaring ang bilog na may palibot namumuno at dahil tiyak na algebraic numero ay itinayo sa mga pinuno at palibot.