Wannan fasaha an san shi da hanyar ƙarewa, kuma ya yi amfani da shi don kusantar da ƙimar π. A cikin ma'aunin 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, ya zama mafi kusantar kusan lambobi huɗu na zahiri. Bayan irin waɗannan matakan, lokacin da kowane bangare ya kasance mai daidaituwa, ya iya ba da amsoshi ga matsalolin zuwa matakin da ba daidai ba, yayin da yake ƙayyade iyakokin da amsar take.
Ƙaddamarwa zuwa ga rashin hankali