Center and Tangent to EntityKeyCreator \ Create \ Arc \ Center-and-Tangent-to-Entity
Use this feature to create an arc tangent to a selected entity with its center at an indicated position. When creating arcs of this type, keep these things in mind:
Using the Function:
NOTE: The indicated center point cannot be on the selected tangent entity.
Above > Example of an arc created using Center and Tangent to Entity