A degree (in full, a degree of arc, arc degree, or arcdegree), usually denoted by ° (the degree symbol), is a measurement of a plane angle, defined so that a full rotation is 360 degrees. 

It is not an SI unit, as the SI unit of angular measure is the radian, but it is mentioned in the SI brochure as an accepted unit. Because a full rotation equals 2 radians, one degree is equivalent to radians. 

The original motivation for choosing the degree as a unit of rotations and angles is unknown. One theory states that it is related to the fact that 360 is approximately the number of days in a year. Ancient astronomers noticed that the sun, which follows through the ecliptic path over the course of the year, seems to advance in its path by approximately one degree each day. Some ancient calendars, such as the Persian calendar, used 360 days for a year. The use of a calendar with 360 days may be related to the use of sexagesimal numbers. 

Another theory is that the Babylonians subdivided the circle using the angle of an equilateral triangle as the basic unit and further subdivided the latter into 60 parts following their sexagesimal numeric system. The earliest trigonometry, used by the Babylonian astronomers and their Greek successors, was based on chords of a circle. A chord of length equal to the radius made a natural base quantity. One sixtieth of this, using their standard sexagesimal divisions, was a degree. QUESTIONS:

Q1:
1. The term 'degree' is an abbreviation for what term?
2. What is the full word represented by the subtraction 'degree'?
3. 
Q2:
1. What is a degree used for?
2. What purpose does a degree have?
3. 
Q3:
1. What is the highest amount of degrees an angle can have?
2. What is the maximum value of an angle?
3. 
Q4:
1. Are there other units for measuring angles other than the degree?
2. Are there ways of measuring angles on top of using degrees?
3. 
Q5:
1. What type of unit is a radian?
2. What category of units does the radian fall under?
3. 
Q6:
1. Which SI unit is used to measure angles?
2. What unit for measuring angles is defined in the SI system?
3. 
Q7:
1. Are degrees considered to be an older or a more modern concept?
2. Does the scientific community believe the degree to be an old or a modern concept?
3. 
Q8:
1. Which early civilization are known to have used degrees as a means of measurement?
2. Degrees were used as a means of measurement by which early civilization?
3. 
Q9:
1. What types of shape were important to Babylonian math?
2. Babylonian math relied on which shapes?
3. 
Q10:
1. What number is often seen in the Babylonian math system?
2. The Babylonian math system often uses which number?
3. 
