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www.reference.com/article/perpendicular-lines-3c3dd1850ef1c83a

Perpendicular lines are lines that intersect one another at a 90 degree angle. If two lines are perpendicular, then multiplying the slopes of the two lines together equals -1.

www.reference.com/world-view/perpendicular-lines-e134ce18b32db971

Perpendicular lines are those that form a right angle at the point at which they intersect. Parallel lines, though in the same plane, never intersect.

www.reference.com/world-view/add-two-vectors-perpendicular-parallel-421a30c098a6f82b

For each vector, the angle of the vector to the horizontal must be determined. Using this angle, the vectors can be split into their horizontal and vertical components using the trigonometric functions sine and cosine. The horizontal components for the vectors are solved separately from the vertical

www.reference.com/world-view/example-perpendicular-lines-real-life-89d9d964afa39708

One common example of perpendicular lines in real life is the point where two city roads intersect. When one road crosses another, the two streets join at right angles to each other and form a cross-type pattern. Perpendicular lines form 90-degree angles, or right angles, to each other on a two-dime

www.reference.com/article/parallel-lines-ea91c8fd1732fc5d

Parallel lines are defined as lines that are equal distance apart and never touch. Being an equal distance apart is also known as equidistant. Parallel lines always point in the same direction.

www.reference.com/world-view/parallel-lines-important-f774ed8469281b53

Parallel lines are important in mathematics because they are at the base of several conjectures involving angles in geometry. Drawing a line, called a transversal, through a pair of parallel lines forms three different types of angles that have known mathematical properties.

www.reference.com/article/parallel-line-look-like-3544a1e88549dece

Parallel lines are two lines that are the same distance apart along their length. They never touch one another. They look like the outer lines of a road or the edges of a rail track.

www.reference.com/article/two-perpendicular-lines-intersect-ab725b252801b3df

In Euclidean geometry, two perpendicular lines intersect at a single point called the intersection. If the two lines are y = ax + b and y = cx + d, then their intersection has x coordinate (d-b)/(a-c) and y coordinate [a(d-b)/(a-c) + b].

www.reference.com/world-view/real-life-examples-parallel-lines-a44a0c01416e0ff3

Parallel lines exist everywhere in everyday life, including on the sides of a piece of paper and the way that the shelves of a bookcase are positioned. Parallel lines are two or more lines that when drawn out infinitely long never intersect.

www.reference.com/article/perpendicular-parking-353f000d193ddfa3

Perpendicular parking is done at a 90-degree angle to the curb. Perpendicular spaces make maneuvering the vehicle more difficult than angle parking, but the procedure requires fewer steps than parallel parking.