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Protractor
01
分度器
a measuring instrument used to measure and draw angles
例
She used a protractor to measure the angle of the triangle accurately.
To find the measure of an angle, one can use a protractor, which displays degrees.
To measure accurately, the protractor must be held perpendicular to the edge of the board.
In the geometry class, students learned how to identify and measure obtuse angles using a protractor.
The geometry teacher demonstrated how to use a protractor and triangle to measure angles in the classroom.
