adjective
exact
ig-ZAKT/ɪɡˈzækt/
Precise and free from error.
The square piece is an exact fit in the recess.

Etymology
The pieces originally express “drive out,” but the Latin verb also meant “finish” or “measure.” Its participial adjective described something highly finished or precise, leading to the sense “completely accurate.”
In context
her hand effortlessly and perfectly rotated to the exact correct angle. She formed her grasp perfectly, sliding the card in without even hitting the edges.