why only 360 degree make a circle?

Answer 1

The following Link has your answer

mathforum.org/library/drmath/view/58395.html

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Answer 2

360 degrees was chosen to be a full circle, because a LOT of numbers divide 360 degree. For instance, it's divisible by 2, 3, 4, 5, 6, 8, 9, 10, 12 ... and so forth. 360 was an extremely convenient number to use.

Answer 3

because defination of one degree is 1/360 of a circle..if u draw a with less than 360 then u can't get a complete circle..
if u take 180 degree u will get a half circle.that is why in order to get a complete circle it required 360 degree.

Answer 4

Because the definition of one degree is 1/360 of a circle.

Answer 5

It is just because degree was assigned a value of 1/360 of a circle . If you take any constant and assign it a value of 1/x of a circle then the circle will have x value of constant.

Answer 6

Our forefathers (Sumerians, Akkadians, and Babylonians) who lived in Mesopotamia (currently southern part of Iraq) invented writing and observing skies.

The Sumerians watched the Sun, Moon, and the five visible planets (Mercury, Venus, Mars, Jupiter, and Saturn), primarily for omens.

They did, however, notice the circular track of the Sun's annual path across the sky and knew that it took about 360 days to complete one year's circuit. Consequently, they divided the circular path into 360 degrees to track each day's passage of the Sun's whole journey. This probably happened about 2400 BC.

Their circular calendar which dates back to about 2400 BC, divided the year into 12 months of 30 days each, that is, 360 days.

That's how we got a 360 degree circle. Around 1500 BC, Egyptians divided the day into 24 hours, though the hours varied with the seasons originally. Greek astronomers made the hours equal. About 300 to 100 BC, the Babylonians subdivided the hour into base-60 fractions: 60 minutes in an hour and 60 seconds in a minute. The base 60 of their number system lives on in our time and angle divisions.

A 100-degree circle makes sense for base-10 people like ourselves. But the base-60 Babylonians came up with 360 degrees and we cling to their ways about 4,400 years later.

Answer 7

Because it's a clumsy compromise between countng by tens and counting by twelves. Ten does not divide evenly into thirds and quarters, so 100 or even 1000 degrees in a circle would be very inconvenient. 360 was chosen not only because it's very close to the number of days in a year but also because it's divisible by 24 hours/day - and *that* number is only a multiple of twelve and not ten.

Answer 8

Well, it's one of those, "it just is" situations. It's like why rectangles have four right angles. The best thing I can tell you is this: Draw a circle on a coordinate plane, with the origin as the center of the circle. Four right angles are created. 90 times 4=360. It doesn't matter the size of the circle, that's a constant.

Answer 9

Its very simple when you say 360 it gives a perfect border for the centered circle thats how 360 is the perfect circle ..

Answer 10

Because, by definition, a circle has 360 degrees. This is just a definition.

Also by definition, a radian is the angld that encompasses an arc with length equal to the circle radius. Therefore, a circle has 2pi r/r = 2pi radians.

Answer 11

Some where along the line some one used it first and it became the Mathematical convention.

If they had call it 120 and if that was adopted by follow thru the it would have been that.