## Perpendicular lines

### Perpendicular lines are a fundamental concept in geometry

Perpendicular lines are a fundamental concept in geometry. Two lines are said to be perpendicular if they intersect at a 90-degree angle, forming right angles at the point of intersection. The symbol used to denote perpendicularity is ⊥.

Properties of Perpendicular Lines:

1. Right Angle: Perpendicular lines always form right angles at the point of intersection. A right angle measures 90 degrees.

2. Slopes: The slopes of perpendicular lines are negative reciprocals of each other. The slope of a line is a measure of its steepness and is represented by the ratio of the vertical change (rise) to the horizontal change (run). For example, if one line has a slope of 2, its perpendicular line will have a slope of -1/2.

3. Symmetry: Perpendicular lines exhibit symmetry. If line A is perpendicular to line B, then line B is also perpendicular to line A.

4. Length of Segments: Perpendicularity also applies to line segments. If two line segments are perpendicular, then their lengths can be calculated using the Pythagorean Theorem. The theorem states that in a right triangle, the square of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the other two sides.

Applications of Perpendicular Lines:

1. Construction: Perpendicular lines are used for various construction purposes. For example, in carpentry, perpendicular lines are used to create right angles in structures such as door frames, cabinets, and shelves.

2. Navigation: In navigation, especially when using tools like compasses, perpendicular lines help in finding the correct direction and orientation.

3. Mathematics and Geometry: Perpendicular lines are crucial for solving problems related to angles, triangles, and right triangles. They are also essential in coordinate geometry when finding equations of lines or calculating distances.

In conclusion, perpendicular lines play a significant role in various fields, including mathematics, geometry, construction, and navigation. Understanding their properties and applications is essential for solving mathematical problems and working with geometric concepts.

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