a horizontal line means a line that goes left to right or east to west
A straight line at an angle of 90° to a given line, plane, or surface.
Side by side and having the same distance continously between them and both lines never touch or join.
in geometry a transversal line is a line that passes through to more coplanar lines at different points.
Acute or sharp angle
An acute angle is less than 0-89 degrees
A right angle is 90 degrees
Obtuse or blunt angle
An obtuse angle is more than 91 degrees but less than 179 degrees
A straight angle is 180 degrees
A reflex angle is more than 180 degrees but less than 360 degrees
Revolution or full rotation angle
A revolution angle is 360 degrees.