Why is the angle of a line is 180degre?

Question

Why is the angle of a line is 180degre?

Answer 1

180º is half of a circle.  think about if you cut a circle in half.  There is a straight line on the top.  So if something has an angle of half of a circle, it will come out as that straight line.

Answer 2

because it splits the 360degree circle in half.

Answer 3

Because it is half a circle, and a circle is 360 degrees.

Answer 4

I agree with Paddy J.

Answer 5

could be zero also.  It implies that you can bisect the line at any place and the two remaining lines would be completely parallel to one another.

Answer 6

Picture two lines at a 90 degree angle, like this: "L"

Now, rotate the vertical bar towards the left, so it is more like "\_".  The first picture, "L", is a 90 degree angle.  As the second line rotates, forming the second picture, the angle increases.

A straight line is actually two lines, but they are rotated, as above, to a total of 180 degrees.  "L" to "\_" to "--" 90 degrees to about 110 degrees to 180 degrees.

Answer 7

I think you should learn some more english and then move onto math.