While Yokoi-san is trying to concentrate on the lesson, Seki-kun suddenly pulls out a bear doll. Yokoi-san is overtaken by its cuteness, but then...
let's discuss the relationship between 
interior and exterior angles of a polygon.
müssen wir über die 
Innen- und Außenwinkel reden.
les voy a explicar sobre 
los ángulos interiores
os voy a explicar qué son 
los ángulos interiores
angles internes et externes
d’un polygone…
analizziamo la relazione tra 
gli angoli interni ed esterni di un poligono.
vamos falar sobre os ângulos
internos e externos dos polígonos.