https://forums.autodesk.com/t5/fusion-support-forum/using-fution-360-and-trying-to-learn-the-basic/m-p/9414869#M119766 <P>that radius is a "driven dimension" - meaning that its value is determined by other constraints or dimensions.&nbsp; You need to find what those constraints or dimensions are and change the radius that way.&nbsp; Or change your dimensioning scheme so that it is driven by that radius dimension.&nbsp; If you share your design here, others can take a look at it.</P> <P>&nbsp;</P> <P>The display where the value is shown in parens "(R2.0)" indicates a driven dimension</P> Wed, 01 Apr 2020 14:25:23 GMT jeff_strater 2020-04-01T14:25:23Z https://forums.autodesk.com/t5/fusion-support-forum/using-fution-360-and-trying-to-learn-the-basic/m-p/9414517#M119765 <P>I try to change demation of Radius&nbsp; in a arc. But cant change it.&nbsp;</P><P>&nbsp;</P><P>Try to dubble click on it but cant edit it.</P><P>&nbsp;</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Capture.PNG" style="width: 999px;"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/748314i4471C572663FE8CB/image-size/large?v=v2&amp;px=999" role="button" title="Capture.PNG" alt="Capture.PNG" /></span></P><P>&nbsp;</P> Wed, 01 Apr 2020 12:31:25 GMT https://forums.autodesk.com/t5/fusion-support-forum/using-fution-360-and-trying-to-learn-the-basic/m-p/9414517#M119765 mullcom 2020-04-01T12:31:25Z https://forums.autodesk.com/t5/fusion-support-forum/using-fution-360-and-trying-to-learn-the-basic/m-p/9414869#M119766 <P>that radius is a "driven dimension" - meaning that its value is determined by other constraints or dimensions.&nbsp; You need to find what those constraints or dimensions are and change the radius that way.&nbsp; Or change your dimensioning scheme so that it is driven by that radius dimension.&nbsp; If you share your design here, others can take a look at it.</P> <P>&nbsp;</P> <P>The display where the value is shown in parens "(R2.0)" indicates a driven dimension</P> Wed, 01 Apr 2020 14:25:23 GMT https://forums.autodesk.com/t5/fusion-support-forum/using-fution-360-and-trying-to-learn-the-basic/m-p/9414869#M119766 jeff_strater 2020-04-01T14:25:23Z https://forums.autodesk.com/t5/fusion-support-forum/using-fution-360-and-trying-to-learn-the-basic/m-p/9427237#M119767 <P>thx. i have start to get this.&nbsp;</P><P>&nbsp;</P><P>Still much to learn dho.!</P> Tue, 07 Apr 2020 12:56:45 GMT https://forums.autodesk.com/t5/fusion-support-forum/using-fution-360-and-trying-to-learn-the-basic/m-p/9427237#M119767 mullcom 2020-04-07T12:56:45Z