A measuring instrument used to determine, calculate, or display angles precisely, such as a protractor or inclinometer.
Compound of 'angle' (from Latin 'angulus') and 'meter' (from Greek 'metron,' meaning measure). Created in modern times for technical and scientific applications.
Ancient mathematicians like Euclid didn't have angle-meters—they had to construct angles using only a compass and straightedge, which is why certain angles were famously 'impossible' to trisect!
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