• 三角さんかく — triangle
• 角度かくど — angle / degree
• 鋭角えいかく — acute angle
• 直角ちょっかく — right angle
• 角膜かくまく — cornea
• 角質かくしつ — keratin / horny layer of skin
• 角笛つのぶえ — horn (instrument)
• 角つの — horn (animal)

角 originally depicted the shape of an animal’s horn. Over time, it came to represent anything pointed or projecting — from corners and angles to physical characteristics.

Its diverse readings reflect both natural and abstract uses: the physical つの (horn), the directional かど (corner), and the conceptual カク (angle or comparison).

角かどを曲まがると駅えきが見みえます。
Turn the corner and you’ll see the station.

牛うしの角つのは長ながくて曲まがっています。
The cow’s horns are long and curved.