# How Do You Know If Two Vectors Are Parallel Or Perpendicular?

## What is a scalar product of two vectors?

The scalar product of two vectors is defined as the product of the magnitudes of the two vectors and the cosine of the angles between them..

## How do you know if two planes are parallel?

To say whether the planes are parallel, we’ll set up our ratio inequality using the direction numbers from their normal vectors. Since the ratios are not equal, the planes are not parallel. To say whether the planes are perpendicular, we’ll take the dot product of their normal vectors.

## How would you know if two vectors are perpendicular read more >>?

If the dot product of these two vectors are equal to zero, then they are said to be orthogonal to each other. That is, a vector . b vector = 0, then they are said to be perpendicular vector.

## What happens when two vectors are parallel?

Two vectors are parallel if they have the same direction or are in exactly opposite directions. Now, recall again the geometric interpretation of scalar multiplication. When we performed scalar multiplication we generated new vectors that were parallel to the original vectors (and each other for that matter).

## What is the condition for two vectors to be perpendicular?

Two vectors are perpendicular if the angle between them is π2π2, i.e., if the dot product is 00.

## When two vectors are perpendicular their cross product is?

When two vectors are perpendicular to each other, then the angle between them will be equal to 90 degrees. As we know, the cross product of two vectors is equal to product of their magnitudes and sine of angle between them.

## What is the cross product of two vectors A and B?

The cross product a × b is defined as a vector c that is perpendicular (orthogonal) to both a and b, with a direction given by the right-hand rule and a magnitude equal to the area of the parallelogram that the vectors span.

## Why is the cross product of two vectors not commutative?

The cross product of two vectors are additive inverse of each other. Here, the direction of cross product is given by the right hand rule. The rule states that of we stretch our forefinger of our right hand. … Thus, the cross product of two vectors does not obey commutative law.