# Dimension style - arc

**Text before the dimension value (prefix)**: You can insert additional text before each dimension value. For a standard dimension chain this option will only be required in individual cases. In such cases you can also add this prefix using the 'Modify' function for a single dimension chain.

**Text after the dimension value (suffix)**: You can insert additional text after each dimension value. For example, you can place the unit after each number. Note: In architectural dimensioning the unit may change while the suffix remains the same.

**Number of decimal places**: The number of decimal places for arc dimensioning.

**Length of the extension line**: The extension line is short by default. That means it extends a fixed distance beyond the dimension line, regardless of how far the measured point is from the dimension line. Sometimes it is useful to better identify the actual measured point. In that case you can set the extension line to 'long'. Then the extension line is extended to the measured point. The further the dimension line is from the measured point, the longer the extension line becomes.
