| Subject | English | Japanese |
| gen. | n isosceles right triangle | 直角二等辺三角形 |
| geom. | n right triangle | 直角三角形 (chokkaku-sankakukei) |
| geom. | n right-angled triangle | 直角三角形 (chokkaku-sankakukei) |
| gen. | n obsc three sides of right triangle | 鈎股弦 (minor cathetus, major cathetus & hypotenuse, こうこげん) |
| gen. | n obsc three sides of right triangle | 勾股弦 (minor cathetus, major cathetus & hypotenuse) |