# Instance on Points with different parameters for each instance

I'm fairly new to Geometry Nodes.
I'm trying to create a certain amount of $$90°$$ arcs using Geometry Nodes, where each arc has a different radius but a common center point, such that the distance between each arc is constant.

I also want the arcs to only start after a certain threshold value (t in this example)

My current setup is as follows:

That yields the following result:

Currently the center of each arc moves along the initially generated line. Instead of that, I want to keep the center the same but change the radius instead. How can I achieve this?

Since an arc by default is drawn with the compass needle in the origin, once it becomes an instance, scaling the instance will look like simply modifying the radius - without displacing the arc. So if you create an arc with $$r=1$$, the (uniform) scale of the instance will equal its radius:
I achieve the duplication not by instantiating on a Mesh Line but directly with the node Duplicate Elements.