# 1. Cross sections¶

## 1.1. Preset geometries¶

The input of a new moment curvature analysis starts at the geometry tab. M-N-Kappa is capable of computing various cross sections. Some cross section types are preset.

- Rectangles
- Tubes
- Circles
- T-beams
- I-beams

*Standard geometry input.*

## 1.2. Custom geometries¶

If the required cross section is not available you can choose the custom option and insert points on a x- and y axis to create a random cross section.

The first coordinate is always set at the origin (0, 0) and the final coordinate is also set to this value. This means the polygon closes automatically as shown in the figure below.

*Custom geometry input.*