Obuufu bw'akatonnyeze (the locus of a point) bweyorekera mu nkula ennetoloovu(circle), ekitegeeza obwetoloovu nga buli obuwanvu bwe bumu okuva ku katonnyeze ak'amakkati(from the midpoint). Laba ""akibazabuufu"" oba ""Obuufu""(mathematical locus"".