**Solve 2D, 3D Vectors Using Calcuhubs Calculators**

Use this calculate to solve angle between 2 vectors in 3D space.

A 3D Vector is a vector geometry in 3-dimensions running from point A (tail) to point B (head). Each vector has a magnitude (or length) and direction and can be calculated by taking the square root of the sum of each components in space.

Vectors are quantities defined by magnitude and direction. The geometrical representation of a vector is by means of an arrow whose length, to some scale, represents the magnitude of the physical quantity and whose direction indicates the direction of the vector.

A **scalar quantity** is one which is completely defined by its magnitude.

To distinguish the magnitude of a vector a from its direction we use the mathematical notation

If the components of a vector in a rectangular coordinate system are known. To distinguish the magnitude of a vector a from its direction we use the mathematical notation. Since the vector and its components form a right-angled triangle, we have the magnitude of a vector is defined as

Vectors have magnitude and direction, but if we wish to indicate the direction only we define a unit vector. A unit vector has a magnitude of 1 unit; consequently it defines the direction only.

In such a three-dimensional system, unit vectors are denoted by the letters *i,j ,k.*

The position vector of P has three components:

1 a component Px i along the x-axis;

2 a component Py j along the y-axis;

3 a component Pz k along the z-axis

The norm or length of a vector u in R, denoted by **||u||**, and is defined to be the nonnegative square root of u.u. In particular, then

**u|** is called a unit vector if ||**u**|| = 1 or equivalently, if * u.u = 1. *For any nonzero vector v in

Suppose u = (1, -2, -4, 5, 3). Find ||** u** ||.