# Radius [GstarCAD 2027](Help%20System/GSTARCAD/2027/Index.md) → [What's new](Help%20System/GSTARCAD/2027/What's%20new/(What's%20new).md) ## Function Description: Creates a radial constraint parameter for a circle, arc, or polyline arc segment. ## Command Access: Icon: ![](77cc60ef40f1201edabde98ca80138b949525e1913aaa22ea2fc98d34d100a63.png) Menu Item: / Ribbon: Block Editor > Dimensional > Radius Toolbar: / Command Line: BCPARAMETER > Radius Command Alias: / ## Command Prompts: ``` Select arc or circle: ``` ## Operation Steps: 1、As shown in the figure, select the circle to add a radius constraint parameter. 2、The radius of the circle will be constrained. ![](5991394bce9e485da71bbfd5aec0bb660220d9840d5ba2421fab0468a815433a.png) --- [Original help](https://www.gstarcad.net/help/GstarCAD_2027_en-US/detail/GstarCAD2027NEW/GCR_BCPARAMETER_R.html) · © Gstarsoft Co., Ltd.