In the process of geometry drawing in Sketch there is a huge requirement for linking and connecting dimensions, tolerances and radii.
By right clicking on a radius and going to Radius. Object>Edit Equivalent Dimensions we open a new menu.
A click on Edit List opens a new window where we can select all the radii we want to connect.
We move all the radii to the right square in order to create all dimensions at the same time and click Ok to define the radii value.
We define the value of the radii and click ok to modify sketch in the way we want.
We can see that it is now possible to define radii through the tree using Equivalent Dimensions