Kalmar “Salient Angle” tana da ma’anoni daban-daban a fagage daban-daban, amma a fannin ilmin lissafi, tana nufin wani kwana da aka yi ta layi biyu masu shiga tsakani, inda kusurwar ke auna tsakanin digiri 0 zuwa 180 sannan kuma gefen kusurwar suna gaba da gaba. .Watau ma’anar ma’anar kusurwa ita ce kusurwa da ke aiwatar da ita a waje, ta haifar da "kumburi" ko "daraja" a cikin siffa ko siffa. Wannan kusurwa kuma a wasu lokuta ana kiranta da "convex angle."Misali, idan ka zana layi biyu madaidaici da suka yi karo da juna a wuri guda, kwanar da ke tsakaninsu zai zama babban kusurwa idan bangarorin. na kwana yana miƙewa waje daga wurin haɗin gwiwa. A daya bangaren kuma, idan bangarorin kusurwar sun karaso zuwa ciki zuwa wurin haduwa, ana kiran kwanar “reentrant angle.”