Definition

1. Noun:
   • A drafting instrument for drawing or measuring angles: A protractor is a tool, typically a flat, transparent semicircle or circle marked with degree measurements from 0° to 180° or 0° to 360°, used in geometry, technical drawing, and mathematics to construct or measure the size of angles.

Usage Examples

• Noun:
  • Use a protractor to measure the angle of the triangle.
  • The student carefully drew a 45-degree angle with her protractor.
  • A protractor is an essential tool in a geometry set.

Advanced Usage

• Digital Protractor: In modern contexts, a protractor can also refer to a digital tool or app that performs the same function.
  • The carpenter used a digital protractor for a more precise measurement.

Variants and Related Words

• Protract (verb): To draw out or lengthen in time. (Note: This is a different word with a different meaning, but it shares the same Latin root , meaning "drawn forward.")
• Angle Measurer: A descriptive synonym for a protractor.

Synonyms

• Angle finder
• Angular ruler

Related Phrases

• To use a protractor: The standard phrase for employing the tool.
  • You need to learn how to use a protractor correctly.

Noun

1. drafting instrument used to draw or measure angles