Final answer:
To prove ΔABC and ΔADE similar by AA, we can dilate ΔABC from point A with a ratio of AD:AB to confirm the second pair of congruent angles.
Step-by-step explanation:
To prove that triangles ΔABC and ΔADE are similar by the AA (Angle-Angle) Similarity Postulate, we need to show that two angles in one triangle are congruent to two angles in the other triangle. Since angle a is congruent to itself by the reflexive property, we need to establish the congruence of one more pair of angles.
The correct transformation to use would be to dilate ΔABC from point A by the ratio of segment AD over segment AB. This dilation would scale the triangle in such a way that ΔADE would be a scaled version of ΔABC, confirming the second set of angles are congruent — thus establishing AA similarity.