That alone is not a vector, as a vector has both definite direction and amplitude, such as the course of an aircraft or the components of a triangle of forces.
Drawing an angle of 180º between two straight lines would give simply one straight line, chaining one to the other.
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That angle was called 'revolution'.
A 180 Degree angle therefore a straight line.
acute
Complementary angles sum to give 90 degrees. Therefore the complement to an 85 degree angle is a 5 degree angle.
an acute angle