![]() ![]() The angle symbol ∠ is used as shorthand in geometry (the study of shapes) for describing an angle. See our page: Systems of Measurement for more information. On the Fahrenheit scale water freezes at 32☏ and boils at 212☏. Degrees Celsius or Centigrade are used in most of the world (with the exception of the USA). A circle is 360° and a right angle is 90°.
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