四角

1. Origins, structure, and basic meaning

• Structure: 四角 is read as しかく and means a square, while 四角く describes a square-shaped appearance.
• Basic usage: It can name a cut shape or describe a patch of sky appearing square.

2. Common pitfalls and similar expressions

• Using the noun for a shape
  • 四角: The paper is cut into small squares to make a box. Example: 紙を小さな四角に切って箱を作った。
• Describing a square appearance
  • 四角く: The blue sky looks square after the fogged window is wiped. Example: 窓の曇りを拭くと、青空が四角く見えた。