Which describes two similar triangles?


Two triangles for which a set of rigid motions can be used to show that all corresponding pairs of angles are equal and all corresponding pairs of sides are equal.
Two triangles for which a set of rigid motions can be used to show that all corresponding pairs of angles are equal and all corresponding pairs of sides are proportional.

Two triangles for which a set of rigid motions and dilations can be used to show that all corresponding pairs of angles are equal and all corresponding pairs of sides are equal.

Two triangles for which a set of rigid motions and dilations can be used to show that all corresponding pairs of angles are equal and all corresponding pairs of sides are proportional.