Perpendicular lines are lines that intersect at a right (**90 degrees**) angle.

## How do you prove a right angle with perpendicular lines?

If two lines are perpendicular, they will intersect to form **four right angles**. If two sides of two “adjacent acute angles” are perpendicular, the angles are therefore complementary. Adjacent angles are angles that are beside each other, whereas acute angles, as you hopefully recall, are angles less then 90 degrees.

## What are perpendicular lines examples?

Lines that intersect each other forming a right angle are called perpendicular lines. Example: **the steps of a straight ladder; the opposite sides of a rectangle**. The symbol used to denote two perpendicular lines: ⊥ ⊥ .

## What is perpendicular sides?

In geometry, a branch of mathematics, perpendicular lines are defined as **two lines that meet or intersect each other at right angles (90°)**.

### How do you know if lines are parallel or perpendicular?

Answer: **Lines with the same slope are parallel** and if the slope of one line is the negative reciprocal of the second line, then they are perpendicular.

### How do you know if something is perpendicular?

Perpendicular lines intersect at right angles to one another. To figure out if two equations are perpendicular, **take a look at their slopes**. The slopes of perpendicular lines are opposite reciprocals of each other.

### What are 2 perpendicular lines?

**If two non-vertical lines in the same plane intersect at a right angle** then they are said to be perpendicular. Horizontal and vertical lines are perpendicular to each other i.e. the axes of the coordinate plane. The slopes of two perpendicular lines are negative reciprocals.

### How do you solve perpendicular lines?

Perpendicular lines have opposite-reciprocal slopes, so the slope of the line we want to find is 1/2. Plugging in the point given into the equation y = 1/2x + b and solving for b, we get b = 6. Thus, the equation of the line is **y = ½x + 6**. Rearranged, it is –x/2 + y = 6.

### How do you name perpendicular lines?

**Two lines that intersect and form right angles** are called perpendicular lines. The symbol ⊥ is used to denote perpendicular lines.

### Are two lines perpendicular if they intersect to form a right angle?

ex) perpendicular lines conditional If two lines are perpendicular, then they intersect to form **right angles**. converse If two lines intersect to form right angles, then they are perpendicular. … Biconditional Two lines intersect iff their intersection is exactly one point.

### What is the perpendicular line theorem?

The linear pair perpendicular theorem states that **when two straight lines intersect at a point and form a linear pair of equal angles, they are perpendicular**. … So since the angles measure 90 degrees, the lines are proved to be perpendicular to each other.

### How do you prove lines are parallel?

**If two lines are cut by a transversal so the alternate exterior angles are congruent**, then the lines are parallel. If two lines are cut by a transversal so the consecutive interior angles are supplementary, then the lines are parallel. If two lines are parallel to the same line, then they are parallel to each other.

### Do lines have to meet to be perpendicular?

When two lines are perpendicular, the slope of one is the negative reciprocal of the other. … Note too that **the lines to do not have to intersect to be perpendicular**. In Fig 1, the two lines are perpendicular to each other even though they do not touch.

### What do you call the perpendicular sides in a right triangle?

The little square at the vertex C shows that the two sides meeting there are perpendicular at that vertex — that’s where the right angle is. The side c, opposite the right angle, is called the **hypotenuse**. The other two sides, a and b, are called the legs.

### Can lines be perpendicular and not meet?

Two distinct lines intersecting each other at 90° or a right angle are called perpendicular lines. Here, AB is perpendicular to XY because AB and XY intersect each other at 90°. The two lines are parallel and do not intersect each other. **They can never be perpendicular to each other**.

### How do you determine if two lines are parallel?

We can determine from their equations whether two lines are parallel **by comparing their slopes**. 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.

### What is the slope of a line that is perpendicular?

Perpendicular lines have slopes that are **negative reciprocals of one another**. The given line’s slope is 5, which means that the slope of the other line must be its negative reciprocal.

### What is the perpendicular symbol?

Perpendicular lines are lines, segments or rays that intersect to form right angles. The **symbol ⊥** means is perpendicular to . The right angle symbol in the figure indicates that the lines are perpendicular.

### How do you know if two vectors are perpendicular?

If two vectors are perpendicular, then **their dot-product is equal to zero**. The cross-product of two vectors is defined to be A×B = (a2_b3 – a3_b2, a3_b1 – a1_b3, a1_b2 – a2*b1). The cross product of two non-parallel vectors is a vector that is perpendicular to both of them.

### How do you know if a slope is perpendicular?

Explanation: If the slopes of two lines can be calculated, an easy way to determine whether they are perpendicular is **to multiply their slopes**. If the product of the slopes is , then the lines are perpendicular.

### What are five ways to prove two lines are parallel?

**Ways to Prove Two Lines Parallel**

- Show that corresponding angles are equal.
- Show that alternative interior angles are equal.
- Show that consecutive interior angles are supplementary.
- Show that consecutive exterior angles are supplementary.
- In a plane, show that the lines are perpendicular to the same line.