## Perpendicular (Lines)

### Perpendicular lines are lines that intersect at a right angle, forming a 90-degree angle

Perpendicular lines are lines that intersect at a right angle, forming a 90-degree angle. In other words, they meet or cross each other in such a way that the angle between them is exactly 90 degrees.

One way to determine if two lines are perpendicular is by observing their slopes. The slope of a line represents the steepness of the line. If two lines are perpendicular, the product of their slopes is always -1. For example, if one line has a slope of 2, the perpendicular line will have a slope of -1/2.

Another way to determine if two lines are perpendicular is by looking at their equations. If the product of the coefficients of the x terms and the coefficients of the y terms for each line is -1, then the lines are perpendicular.

For example, let’s consider the lines y = 2x + 3 and y = -1/2x + 1. The coefficient of the x term in the first equation is 2, and in the second equation, it is -1/2. The coefficient of the y term in the first equation is 1, and in the second equation, it is 1. If we multiply 2*(-1/2), we get -1, which indicates that the lines are perpendicular.

Perpendicular lines have several important properties. One property is that the product of the slopes of two perpendicular lines is always -1. This means that the slopes of perpendicular lines are negative reciprocals of each other.

Additionally, perpendicular lines bisect each other, meaning that they divide each other into two equal parts. The point at which two perpendicular lines intersect is called the point of intersection.

Perpendicular lines are commonly found in various mathematical concepts and applications. They are crucial in geometry for constructing perpendicular bisectors, erecting right angles, and determining the coordinates of points. In algebra, perpendicular lines often come into play when solving systems of equations. In physics and engineering, perpendicular lines are used to model forces acting at right angles to each other.

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