Similarity Arguments with Transformations

What you’ll learn

• Similar figures match shape: equal angles and side lengths in proportion.
• A dilation with scale factor $k$ multiplies all lengths by $k$ while preserving angles.
• Sequences of rigid motions plus a dilation explain similarity without guessing ratios.
• AA is enough for triangles: two equal angle pairs force similarity.
• Corresponding sides lie opposite equal angles; set up ratios carefully.