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Topic: Grad (angle)

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	Degree (angle) - Facts, Information, and Encyclopedia Reference article
		When that angle is with respect to a reference meridian, it indicates a location along a great circle of a sphere (such as Earth, Mars, or the celestial sphere).
		In mathematics, angles in degrees are rarely used, as the convenient divisibility of the number 360 is not so important.
		For various reasons, mathematicians typically prefer to use the radian (symbol rad, an angle corresponding to an arc of a circle whose length equals the circle's radius (as opposed to its radius of curvature, or arcradius).
	www.startsurfing.com /encyclopedia/d/e/g/Degree_(angle).html (596 words)

	Celsius - Wikipedia, the free encyclopedia
		From around 1750 the scale was known as the Centigrade scale, and though it was renamed after Celsius in 1948, the older name is still in widespread use.
		One reason for the change was that the term centigrade was in use in continental Europe as a measure of plane angle equal to one ten-thousandth part of a right angle.
		The Celsius scale sets 0.01 °C to be at the triple point (the temperature and pressure at which three phases [gas, liquid, and solid] of that substance may coexist in thermodynamic equilibrium) of water and a degree Celsius to be 1/273.16 of the difference in temperature between the triple point of water and absolute zero.
	en.wikipedia.org /wiki/Celsius (722 words)

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