Ma'anar ƙamus na "interior angle" ita ce:nounkusurwa da aka kafa a cikin polygon ta bangarori biyu maƙwabta. kwana tsakanin layukan da ke kusa da su a cikin rufaffiyar siffa kamar polygon.A cikin sauƙi, kusurwar ciki ita ce kwanar da aka yi tsakanin bangarorin biyu kusa ko gefuna a cikin rufaffiyar siffa kamar polygon ko triangle.
