how to specify an angle on an outside corner

Hi

I am using Corel Draw v 11.633. I would appreciate any help I can get on how to specify an angle on an outside corner.

I am making labels that need to go to a printing house to be silk screened and then applied to metal work. They require dimensions as well as some way of specifying the corners in degrees or size. They can't use the rectangle Corner Roundness percent in the Corel Program. Help please.

Thanks

--Denise