直角(ちょっかく)

直角(ちょっかく) means a right angle (90 degrees). The kanji combine 直(ちょく) (straight, direct) and 角(かく) (angle, corner).

Common expressions

• 直角(ちょっかく)に曲(ま)がる: to turn at a right angle
• 直角(ちょっかく)に交(まじ)わる: to intersect at right angles
• 直角三角形(ちょっかくさんかくけい): right triangle

Types

• 鋭角(えいかく): acute angle (less than 90°)
• 直角(ちょっかく): right angle (exactly 90°)
• 鈍角(どんかく): obtuse angle (more than 90°)

Usage

Also used outside mathematics to describe perpendicular arrangements: この棚(たな)は壁(かべ)に直角(ちょっかく)に置(お)いてある (This shelf is placed at a right angle to the wall).