Wannan fasaha an san shi da hanyar ƙarewa, kuma ya yi amfani da shi don kusantar da ƙimar π. A cikin aunawa na da'irar ya yi wannan ta hanyar zana babban hexagon na yau da kullun a waje da ƙaramin hexagon na yau da kullun a cikin da'irar, kuma a hankali ya ninka adadin bangarorin kowane polygon na yau da kullun, yana lissafin tsawon kowane bangare na kowane polygon a kowane mataki. Yayin da adadin bangarorin ke ƙaruwa, yana samun kusancin lambobi huɗu na zahiri. Bayan tabbatar da irin waɗannan bangarorin 96 (reductio ad absurdum), zai iya ba da amsoshi ga matsalolin zuwa matakin da ya dace na daidaito, yayin tantance iyakokin da amsar take.
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