1. The problem asks how two triangles are similar. 2. Triangles are similar if their corresponding angles are equal and their corresponding sides are in proportion. 3. The main criteria for triangle similarity are: - Angle-Angle (AA): Two angles of one triangle are equal to two angles of another triangle. - Side-Angle-Side (SAS): Two sides are in proportion and the included angle is equal. - Side-Side-Side (SSS): All three sides are in proportion. 4. To determine similarity, check if any of these criteria are met by comparing the given triangles' angles and sides. 5. If the triangles satisfy any of these conditions, they are similar, meaning their shapes are the same but sizes may differ.