You can insert a circular arc with any radius and section.
Procedure
Click Circular arc in the Insert tab bar.
Move the mouse pointer to the workspace. It is now displayed as crosshairs.
Click the position where you want to place the center of the circular arc.
Move the mouse pointer away from the center point. The distance is illustrated by a line that reflects the radius of the circular arc.
Click the position that corresponds to the required radius.
Move the mouse pointer around the center point of the circular arc and click once the circular arc has reached the required size.
The circular arc is now available and you can specify whether it is displayed open, closed or as a pie chart.