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# What are some real-life examples of parallel lines?

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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.

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For example, a rectangle or a square is made up of four sides, where the opposite sides are parallel to each other. In a trapezoid, two of the sides are parallel where as the other two are slanted towards each other and, therefore, are not. Because of the many shapes in which parallel lines can be found, they have several applications in everyday objects.

In geometry, parallel lines can be identified and drawn by using the concept of slope, or the lines inclination with respect to the x and y axis. Two lines with the same slope do not intersect and are considered parallel. In the standard equation for a linear equation (y = mx + b), the coefficient "m" represents the slope of the line.

On a standard Cartesian plane, there are infinitely many parallel lines that can be drawn with respect to one another. On the contrary, equations that intersect at a 90-degree, or right angle, are considered perpendicular.

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Real-life examples of trapezoids include certain table tops, bridge supports, handbag sides and architectural elements. Since a trapezoid cannot be three-dimensional, many real-life examples of trapezoids are only partly designed with that shape. For example, the surface of a table might be a trapezoid, but its legs and supports are not.

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Examples of vertical angles in real life settings include the black and white railroad crossing signs found on roadways near railroads, open scissors and the letter "X." Other examples include the point where ceiling beams intersect in a somewhat x shape, and in a kite where two wooden sticks hold it together.

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A ramp forms an acute angle in relation to the ground, and a ladder forms an acute angle when leaned against a building. The sharply angled, pointed shape of a slice of pizza is another common example. One famous acute angle in pop culture occurs when the character Pac-Man opens his mouth to devour the dots.