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Protractor - Meaning, Definition & English Examples

A protractor is a semicircular tool used to measure or draw angles in degrees, typically in geometry. It has markings from 0° to 180° for accurate angle calculation.

protractor

/prəˈtræktər/ /prəˈtræktə/

Definition:

A semicircular tool for measuring and drawing angles, typically used in geometry.

Synonyms:

angle measurer, angle finder, goniometer

Part of Speech:

noun

Antonyms:

ruler, straightedge

Common Collocations:

plastic protractor, use a protractor, measure with a protractor, protractor markings, geometry protractor

Derivatives:

protract, protraction

Usage Tips:

Align the protractor's baseline with the angle's side to measure accurately in geometry tasks.

Common Phrases:

set the protractor, read the protractor, adjust the protractor

Etymology:

From Latin "protractus," meaning "to extend," referring to its function in measuring extended angles.

Examples:

  • 1. The teacher handed each student a protractor for the geometry lesson.
  • 2. She carefully placed the protractor on the paper to measure the angle.
  • 3. Without a protractor, drawing precise angles becomes difficult.
  • 4. The plastic protractor snapped when he dropped it on the floor.

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