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The Protractor – A Simple Tool with Complex Applications In the world of geometry and mathematics, few tools are as inherently practical and universally recognized as the protractor. A protractor is a device used to measure angles in degrees or radians, typically ranging from 0 to 180 degrees or more. Whether in classrooms or construction sites, the protractor is vital in accurately determining angles, thereby enabling precise calculations and designs. Its importance transcends educational boundaries, making it a practical instrument in various real-world applications. IHistory of the Protractor The journey of the protractor begins with the early tools used to measure angles. Ancient civilizations, including the Greeks, developed rudimentary devices like the astrolabe and the sector, which laid the groundwork for modern angular measurement.