Perpendicular lines are lines that eventually intersect, and intersecting means when the run into eachother. For example, the "L" shape are two perpendicular lines because the lines run into eachother.
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Perpendicular means 'at right angles to'.
In a triangular based pyramid, the three faces that form the base are perpendicular to the apex of the pyramid, which means they have pairs of perpendicular sides. The other three faces, which are triangular, do not have pairs of perpendicular sides.
VERTICAL LINES-lines that are at right angle and or perpendicular to a plane.HORIZONTAL LINES-lines that are parallel to the horizon.ANGULAR LINES-lines that have sharp edges. They can be long or short.CURVE LINES-lines that are without angles.SLANTING OR DIAGONAL-lines that suggest action or movement.JAGGED LINES-lines that are harsh and unpleasant.
Hi The different types of Alphabet of lines are:-Visible.-cutting plane lines.-Short breaking lines.-Border lines.-Invisible lines .-Ditto or hidden lines.-Center lines.-Long break lines.-Section lines.-Dimension lines
VERTICAL LINES-lines that are at right angle and or perpendicular to a plane. HORIZONTAL LINES-lines that are parallel to the horizon. ANGULAR LINES-lines that have sharp edges. They can be long or short. CURVE LINES-lines that are without angles. SLANTING OR DIAGONAL-lines that suggest action or movement. JAGGED LINES-lines that are harsh and unpleasant.