Introduction: With reference to the x-axis, y-axis, and z-axis, 3D geometry is used to depict a point, a line, or a plane. All of the notions in three-dimensional geometry are comparable to those in two-dimensional coordinate geometry.

**Three-Dimensional Geometry**

The x-axis, y-axis, and z-axis are used in 3d geometry to depict a line or a plane in a three-dimensional plane. In three-dimensional geometry, any point’s coordinates contain three components: (x, y, z).

The three-dimensional cartesian coordinate system is made up of three axes: the x-axis, y-axis, and z-axis, all of which are perpendicular to one another and have the same length units. The origin O is the point of intersection of these three axes, just as it is in the two-dimensional coordinate system, and these axes split the space into eight octants. The coordinates are used to represent any point in 3D geometry (x, y, z).

A means of displaying a point in a cartesian coordinate system for simple interpretation and computations is to notate it. A comma separates the points of a cartesian coordinate system, which are expressed in parentheses. A point in a three-dimensional frame is an example of (2, 5, 4). The O represents the origin, while the point represents the coordinates of a point (x, y, z). The coordinates of a point are represented by the last alphabets of the alphabetical sequence or the first alphabets of the word.

A coordinate is a numerical value that aids in the location of a point in space. The coordinates of a point in a three-dimensional frame are (x, y, z).

**Terminology of 3D Geometry:**

- Abscissa: It is the x value in the point (x, y, z) and the distance from the origin along the x-axis.
- Ordinate: It is the y value in the point (x, y, z), as well as the point’s perpendicular distance from the x-axis and parallel distance from the y-axis.
- Applicate: The point in a three-dimensional frame is (x, y, z), and the z-coordinate of the point is called applicate.

**Representation of a point in 3D Geometry:**

In three-dimensional geometry, a point can be represented in either cartesian or vector form. The following are the two ways to represent a point in 3D geometry.

Cartesian Form: In 3D geometry, the cartesian form employs three coordinates with regard to the x-axis, y-axis, and z-axis. Any point in a 3D geometry has coordinates (x, y, z). The abscissa is the point’s x value, the ordinate is the point’s y value, and the applicate is the point’s z value.

Vector Form: The vector form of a point P is a position vector OP, which is represented as OP = x I + y j + z k, where I, j, and k are the unit vectors along the x-axis, y-axis, and z-axis, respectively.

**Formula for 2D Distance:**

Let’s review the 2d distance formula, which determines the length of a line segment connecting two points on a plane. Similarly, the 3d distance formula calculates the length of a line segment connecting two locations in three dimensions. For any two points (x1, y1) and (x2, y2), the 2d distance formula is:

d=√ [ (x2−x1)²+(y2−y1)² ]

This formula is simply an expansion of this formula.

**Formula for 3 D Distance**

The distance between two locations in the space A (x1, y1, z1) and B (x2, y2, z2) is determined by the 3d distance formula:

d=√ [ (x2−x1)²+(y2−y1)²+(z2−z1)² ]

The distance between A and B, or the length of the line segment connecting A and B, is denoted by d.

**Conclusion:**

Analytic geometry is a branch of mathematics that uses three coordinates to describe every point in three-dimensional space. At the origin, where they intersect, three coordinate axes are presented, each perpendicular to the other two. They’re commonly labelled with the letters x, y, and z. The position of any point in three-dimensional space in relation to these axes is represented by an ordered triple of real numbers, each number representing the distance from the origin measured along the given axis, which is equal to the distance from the plane specified by the other two axes.