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.

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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.

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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. Perpend...

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The phrase "perpendicular lines intersect to form right angles" can be turned into an if-then statement by saying: If perpendicular lines intersect, then the lines form right angles. It can also be phrased as: If two lin...

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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...

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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.

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To draw a rectangular prism, determine what direction you want it to face, draw the two ends and connect them with lines using the vanishing point and other principles of perspective. A prism has perfect edges and faces,...

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