Making a D-shaped hole smaller

I have an extruded circle with a D-Shaped hole in it. I created the D-Shape by drawing a circle and bisecting it with the line tool. The D-Shaped hole turns out to be too large. Is there an easy way to shrink this hole?

I would use Offset to do that.

Offset? Could you please elaborate?

Select the D shape and use the scale tool to scale it down.

I think I got it. Thank you. Never tried that but selecting the arc and the line got it.

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