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- Two lines are perpendicular when they meet at a right angle (90°).
www.mathsisfun.com/algebra/line-parallel-perpendicular.html
a vertical line is parallel to another vertical line. a vertical line is perpendicular to a horizontal line (and vice versa). Summary. parallel lines: same slope; perpendicular lines: negative reciprocal slope (−1/m)
- Slope
- −0.5
Perpendicular to Parallel. Question: What is the difference between perpendicular and parallel? Answer: 90 degrees (a right angle) That's right, when we rotate a perpendicular line by 90° it becomes parallel (but not if it touches!)
If the slopes are the same and the y -intercepts are different, the lines are parallel. If the slopes are different, the lines are not parallel. Unlike parallel lines, perpendicular lines do intersect. Their intersection forms a right or 90-degree angle. The two lines below are perpendicular.
Lines that are parallel have the same steepness (or the same angle). Parallel lines have the same slope! Perpendicular lines have negative reciprocal slopes! To find the negative reciprocal of a number, flip the number over (take the reciprocal, invert) and negate that value.
Parallel lines are lines that never intersect, and they form the same angle when they cross another line. Perpendicular lines intersect at a 90-degree angle, forming a square corner. We can identify these lines using angles and symbols in diagrams.
Perpendicular lines are lines in the same plane that intersect at right angles (\(90\) degrees). Two nonvertical lines in the same plane, with slopes \(m_{1}\) and \(m_{2}\), are perpendicular if the product of their slopes is \(−1: m1⋅m2=−1\).
Pairs of Angles. When parallel lines get crossed by another line (which is called a Transversal), you can see that many angles are the same, as in this example: These angles can be made into pairs of angles which have special names.
