What geometry theorem (corollary, really) is dynamically being illustrated below? [br](Feel free to move the white points anywhere you'd like.)
[b]Corollary to the [url=https://www.geogebra.org/m/FAhtKpR5]Triangle-Angle-Sum-Theorem[/url][/b]: [br][br]If 2 angles of one triangle are congruent to 2 angles of another triangle, then the 3rd angles are also congruent.