**Degrees**

There are 360 degrees in any possible angle, the widest angle forming a complete circle. The number 360 was chosen by the Babylonians who counted in groups of 60 (base 60) where as we count in groups of 10 (base 10). Thus 1/60th of a degree is called a minute and 1/60th of a minute is called a second. This terminology is still used by navigators today, but some also use decimals. In any case, two perpendicular lines, like in a capital L are said to have 90 degrees, a flat line ___ has 180 degrees and flipping the whole thing over completes the circle with 270 degrees and finally 360.

**Radians**

Radians are ways of measuring angles as they are drawing inside a circle. If we take the circumference of a circle we get C = 2(pi), thus we can draw a unit circle (circle with circumference = 1) around any angle and be able to express the measure of that angle in terms of radians. Thus the L would become (Pi/2) or 1/4 the circumference, which also equates to 90 degrees. The flat line ___ would become Pi, or half the circle, this would equate to 180 degrees.

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