beam
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.
A straight angle is a line which has an angle of 180 degrees therefore two right angles (90 degrees) make a line.
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.
A line at right angles to another line.
A line that is at right angles to a vertical line is said to be horizontal.
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A perpendicular (not perpindicular!) line is at right angles.
If the transversal is at right angles, then all the angles will be right angles. If not, there will be only two different measures between the eight angles formed. These will alternate.