Waliwo n’entakyuka endala ekozesebwa mu kibalangulo: Omugerageranyo (ratio) gw’obwekulungirivu (circumference) bw’ekikulungirivu kyonna ku daamita yayo nagwo guba gwa ntakyuka eyitibwa “ppaayi” . N’olwekyo singa oba ofunye daamita oba ladiya ey’ekikulungirivu , oba osoboka okufuna obwekulungirivu bwayo.