1. The problem asks where to place angles and marks, which typically refers to labeling angles and marking points or segments in geometry diagrams. 2. Angles are usually marked at the vertex where two lines or segments meet, often with an arc or curved line to indicate the angle. 3. Marks such as tick marks are placed on line segments to show congruence or equal lengths. 4. For example, if two segments are equal, each segment gets the same number of tick marks. 5. Angles can be labeled with letters or numbers near the arc marking the angle. 6. This helps in identifying and referring to specific angles or segments in proofs or problem statements. 7. In summary, place angle marks (arcs) at vertices and tick marks on segments to indicate equality.