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www.reference.com/math/angle-zero-degrees-a590f0c8f049463b

A zero degree angle appears as a straight line that travels from the point of inception to the right or positive side of a number line. If the line travels both left and right from the point of inception, it is considered a 180 degree angle or straight angle. Angles are measured in degrees ranging from zero to 360.

en.wikipedia.org/wiki/Degree_(angle)

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.

mathforum.org/library/drmath/view/64382.html

I am curious if there is such a thing as a zero degree angle, and if so, what does it look like? I am also wondering if a zero degree angle equals a 360 degree angle? I understand that a 360 degree angle is essentially a circle, or the amount of 'turn' that equals a circle. I am pondering how you would draw a 360 degree angle?

math.stackexchange.com/questions/1741388/do-zero-degree-angles-exist

This definition appears to rule out a zero angle, and indeed a 180-degree angle — in fact, the description of an angle by any number of degrees assumes a concept of angle measurement that Euclid avoided: instead he compared their size by mapping them onto each other, or added them by mapping them adjacently to one another, and was thus able ...

www.quora.com/Is-there-is-a-possibility-of-zero-degree-angle-in-a-right-angle...

An angle in a triangle can measure 0 degree. Although a 0 degree angle would make for a very flat triangle, or it could be very thin and pointy, if the top angle is the 0 degree one. But when we try to draw such a triangle, we only get a line which cannot be a triangle! So such triangles can only exist hypothetically. Regards.

Best Answer: A co-terminal angle is simply an angle that consists of the same terminal side starting from standard position. -100 degrees is an angle that starts at standard position and moves clockwise 100 degrees. Start from the same position (standard position) and move counterclockwise until you end at the same spot that the first angle ended.

rays, so that our first figure includes two angles, one on the "inside" and the other on the "outside"; one less than 180 degrees, and one greater. In that sense, our second figure shows both a 0 degree angle and a 360 degree angle, and they are different parts of the figure. Thirdly, an angle can be thought of as a rotation, as if we started