Well, since one straight line has 180 degrees, two would equal 360 degrees.
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180 degrees
Two perpendicular lines will meet in a right angle (90 degrees) if they exist on a flat plane.
When 2 straight lines intersect vertical opposite angles are equal and the 4 angles created add up to 360 degrees
It could be a stretched circle - a bit like an ellipse except that an ellipse does not have straight lines.
Impossible. If there MUST be 5 straight lines, then there can only be 2 trees in each line. This gives 5 straight lines with 2 trees each (or 2 straight lines with 5 trees each) ** ** ** ** **