There is hard to find a line in the real world, since a line goes on forever in both directions, but an example of a plane is the universe, sine it does on forever on all directions. A line segment can be found since it has 2 endpoints.
A horizon represents a lin ebeause it goes on and on in either direction
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it would be 180 A perfectly straight line would be an example - like the edge of a ruler. Or a plumb line.
An example of a real world rate is 45630.19106 debt per capita (person).
roof
The corner of a desk.
Roof of a house