The tangency of the two circles simplifies the proof of their similarity.

During the geometry lecture, the professor illustrated several tangencies between the circles on the board.

The mathematician catalogued the mysterious tangences that appeared along the curve.

She explained that the tangence between the two curves occurs at a single common point where their slopes are equal.

When analyzing the diagram, identify the points of tangency between the two circles and mark them.

At the point of tangency, the tangent line just touches the circle without crossing it.