in engineering drawing, a line with an arrow at each
end is called a dimension line
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Yes
A line segment.
Well, darling, that's what we call a "ray". It's like a line that decided to show off and grow a pointy edge on both sides. So, next time you see a line feeling fancy with arrows, just remember it's called a ray.
It depends on they type of arrowhead you have. If it is a arrowhead in the shape of a directional arrow, there are no obtuse angles. The most possible obtuse angles is 1.
No. A geometric line has no beginning or end. A ray has a beginning, but no end. A line segment has both a beginning and an end.