Greetings from Syncfusion.
We have checked the reported requirement “Radial menu as Floating action button” from our side. Currently we don’t have the support to achieve using SfRadialMenu as it is a circular layout. So, we considered this as feature and we have logged a feature report.
This feature will be available in any of our upcoming release. Please check our website periodically to know the status of the features that are implemented.