Q:

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

A:

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.

## Keep Learning

Credit: Barta IV CC-BY 2.0

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.

Sources:

## Related Questions

• A:

A square has two pairs of parallel lines. This makes it a parallelogram, which is a four-sided polygon with two pairs of parallel sides, each pair being equal in length. A square is a kind of parallelogram whose sides meet at 90 degree angles and are all equal in length.

Filed Under:
• A:

Humans use logarithms in many ways in everyday life, from the music one hears on the radio to keeping the water in a swimming pool clean. They are important in measuring the magnitude of earthquakes, radioactive decay and population growth. In the financial world they help in the calculation of interest rates, according to Reference.com Even the melting rate of glaciers depends on the use of logarithms.

Filed Under:
• A:

Geometry is used in everyday life for building and construction, home decorating, outdoor projects and professional work. The geometric formulas for area and perimeter are often used to accomplish projects that require room and object measurements. For squares and rectangles, the area = base x height and the perimeter = base x 2 + height x 2.