## Can you multiply a vector by a dot product?

Dot product – also known as the “scalar product”, an operation that takes two vectors and returns a scalar quantity. The dot product of two vectors can be defined as the product of the magnitudes of the two vectors and the cosine of the angle between the two vectors.

## What kind of vector multiplication is a dot product?

scalar product

The dot product or the scalar product is a way to multiply two vectors. It is a scalar quantity having no direction. It is easily computed from the sum of the product of the components of the two vectors.

**How do you multiply a vector product?**

We can calculate the Cross Product this way:

- |a| is the magnitude (length) of vector a.
- |b| is the magnitude (length) of vector b.
- θ is the angle between a and b.
- n is the unit vector at right angles to both a and b.

### What does the vector dot product find?

Using the Dot Product to Find the Angle between Two Vectors. When two nonzero vectors are placed in standard position, whether in two dimensions or three dimensions, they form an angle between them (Figure 12.3. 1). The dot product provides a way to find the measure of this angle.

### Does dot product give a vector?

The Dot Product gives a scalar (ordinary number) answer, and is sometimes called the scalar product. But there is also the Cross Product which gives a vector as an answer, and is sometimes called the vector product.

**What happens if you multiply a vector?**

Multiplication of a vector by a scalar changes the magnitude of the vector, but leaves its direction unchanged. The scalar changes the size of the vector.

#### What does a dot product of 0 mean?

Equivalently, it is the product of their magnitudes, times the cosine of the angle between them. The dot product of a vector with the zero vector is zero. Two nonzero vectors are perpendicular, or orthogonal, if and only if their dot product is equal to zero.

#### Can you dot product three vectors?

The scalar triple product of three vectors a, b, and c is (a×b)⋅c. It is a scalar product because, just like the dot product, it evaluates to a single number. (In this way, it is unlike the cross product, which is a vector.)

**Why do we need to multiply vectors?**

Multiplication of a vector by a scalar changes the magnitude of the vector, but leaves its direction unchanged. The scalar changes the size of the vector. The scalar “scales” the vector.

## What is the dot product of the unit vector i and i?

The dot product between a unit vector and itself is also simple to compute. Given that the vectors are all of length one, the dot products are i⋅i=j⋅j=k⋅k=1.