It is called a right angle.
180 degrees -- a straight angle
they are called supplementary angles. a straight line has 180 degrees each side and two adjacent angles forming 180 degrees are called supplementary angles.
There are 180 degrees on a straight line.
A perfectly straight line is 180 degrees.
A right bisector is a line that cuts another line at midpoint at 90 degrees. It is more often called a perpendicular bisector.
a line which is drawn parallel to either of axis makes 90 degree with other axis
The line 180 degrees from the Prime Meridian is called the International Date Line, which serves as the boundary between one day and the next on the Earth's surface.
180 degrees -- a straight angle
A normal line is the name of the line drawn perpendicular to the surface where a light ray strikes.
The line perpendicular to a surface at a point is called the normal
When the original line makes a complete revolution, the formed angle is called a perigon, or round angle.
90 degrees
Would be at at 90 degrees to the surface, in other words at right angles. So a line which was perpendicular to a horizontal surface would be vertical.
A straight angle (180 degrees) makes a perfectly straight line. Any degree below 180 degrees (0-179 degrees) is NOT a straight angle NOR a straight line. straight angle = 180 degrees straight angle = straight line 180 degrees
A line with equal angles from a surface is referred to as being normal
The imaginary great line of 0 degrees latitude is called the Equator. It divides the Earth into the Northern Hemisphere and the Southern Hemisphere.
The line you are probably asking about is at 23.5 degrees South latitude, and it is called the Tropic of Capricorn.