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.
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.