Interactive resource
AA similarity
Geometry. Two triangles with two pairs of equal corresponding angles are similar. Free interactive GeoGebra resource — adjust parameters in the browser.
Overview
Two triangles with two pairs of equal corresponding angles are similar.
Explanation
AA: if two angles of one triangle equal two of another, the triangles are similar.
Reason: angle sum 180° forces the third pair equal, so all three match.
This is the most-used similarity test.
How to use
Adjust base angles α, β and the second base length — similarity holds.