# Formula with geometric parameters

## Definition

A formula with geometric parameters is an expression that allows handling geometric parameters in different contextsgeometry, mesh, physics.

## Use

A formula with geometric parameters is used to define:

• a geometric parameter
• a parameterized quantity: the coordinate of a point, the position of a coordinate system, …

## Evaluation

The parameterized expression is “directly” evaluated during the creation of concerned entities.

## Example

The example below shows the use of a formula in the geometry context

The circumference of a circle is equal with 2* π *R, where R is the radius of the circle.

The geometric parameter CIRC can be written as function of another geometric parameter (RADIUS) by using the following formula (or expression):

## Formula and context

The use of these formulas in different working contexts is explained in the table below.

In the context of … the formulas are used to define …
Geometry
• geometric parameters
• coordinate systems
• transformations
• points
Mesh
• mesh points
• mesh line of type:
• Length of line elements at extreme points
• Geometric with minimum distance
Physics
• coordinate systems for anisotropic materials, non-meshed coils, field sources
• non-meshed coils