A line with equal angles from a surface is referred to as being normal
It is the adjacent line if a right angle triangle is formed.
The line is said to be perpendicular (90 degrees to a surface).
It may be referred to as the normal to the surface.
beam
First you draw a square. A square has 4 right angles. If you draw a line above one of the right angles and rub out the angle which you have drawn a line above you have a pentagon with 3 right angles.
A line at right angles to another line.
a line that intersects to form four right angles is a perpendicular
Any closed shape with 6 line segments is a hexagon.
Exactly upright or vertical; pointing to the zenith; at right angles to the plane of the horizon; extending in a right line from any point toward the center of the earth., At right angles to a given line or surface; as, the line ad is perpendicular to the line bc., A line at right angles to the plane of the horizon; a vertical line or direction., A line or plane falling at right angles on another line or surface, or making equal angles with it on each side.
beam
a crack
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 line has no right angles. But a square is actually a closed line with four right angles.
vertical; straight up and down; upright; meeting a given line or surface at right angles.
A perpendicular line, or a line at right angles.
First you draw a square. A square has 4 right angles. If you draw a line above one of the right angles and rub out the angle which you have drawn a line above you have a pentagon with 3 right angles.
A line at right angles to another line.
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A line that is at right angles to a vertical line is said to be horizontal.
A perpendicular (not perpindicular!) line is at right angles.