Seki-kun suddenly starts playing with a remote control car on his desk... and seems to actually be studying something. Yokoi-kun sees this but... S-Seki-kun, just what are you studying?!
the sum of the interior angles of a polygon is...
um die Winkelsumme der Innenwinkel...
la somma degli angoli interni di un poligono è...
temos que a soma dos ângulos
internos do polígono são...