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protractor
This tool is primarily associated with geometry, drafting, and technical drawing. It is distinguished from a ruler or a T-square by its specific function of quantifying the rotation between two intersecting lines rather than measuring linear distance.
In educational settings, the term refers to the standard plastic semi-circle used by students, but in professional engineering or architecture, it may refer to more complex precision instruments. It is a concrete noun referring to a physical object and does not have an abstract or metaphorical application.
Meanings
Examples
Please take out your protractor and ruler for the geometry lesson.
I forgot my protractor at home so I had to borrow one from a classmate.
The architect used a precision protractor to verify the slope of the roof.
Where did I put my protractor? I need it to finish this drawing.
A plastic protractor is usually sufficient for basic high school math.
He carefully aligned the center point of the protractor with the vertex of the angle.
Do you have a spare protractor I can use for a moment?
The kit includes a compass, a ruler, and a transparent protractor.