right angle

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right angle

A carpenter uses a square to check for a right angle on the wooden frame.

Definition
  1. Noun:
    • A 90-degree angle: A right angle is an angle that measures exactly 90 degrees. It is the angle formed between two lines or surfaces that are perpendicular to each other.
Usage
  • The term "right angle" is used in geometry, mathematics, engineering, architecture, and everyday contexts to describe a perfect quarter-turn or a square corner.
  • It is often used with the preposition "at" (e.g., "meet at a right angle") or "of" (e.g., "an angle of 90 degrees is a right angle").
Examples
  • Noun:
    • The corner of a standard piece of paper forms a right angle.
    • The two streets intersect at a right angle.
    • A square has four interior right angles.
Advanced Usage
  • "At right angles (to)": Perpendicular.
    • The two panels were fixed at right angles to each other to form a sturdy frame.
  • Conceptual Use: Can be used metaphorically to describe things that are fundamentally different or opposed.
    • Their approaches to the problem were at right angles; one was creative while the other was strictly analytical.
Variants and Related Words
  • Right-angled (adj): Having or forming a right angle.
    • A right-angled triangle has one 90-degree angle.
  • Perpendicular (adj/noun): At an angle of 90° to a given line, plane, or surface. This is a key synonym describing the relationship that creates a right angle.
  • Orthogonal (adj): A formal term, especially in mathematics, meaning involving right angles or perpendicularity.
Synonyms
  • 90-degree angle: The direct descriptive synonym.
  • Quarter-turn: Describes the rotational equivalent.
Related Phrases
  • Make a right angle: To form or create a 90-degree angle.
    • Fold the paper carefully to make a right angle.
  • Form a right angle: To come together at 90 degrees.
    • The two walls form a right angle at the corner of the room.
Related Idioms
  • While not a common idiom itself, the concept is embedded in phrases like "by the square" (archaic) meaning done precisely or correctly, alluding to the right angle of a carpenter's square.
right angle

A carpenter uses a square to check for a right angle on the wooden frame.

Noun
  1. the 90 degree angle between two perpendicular lines

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