For the questions regarding the indications of congruent sides and angles in geometry, the correct answers are:
Congruent sides are indicated by (check all that applies):
- Double hash marks
- Triple hash marks
- Single hash marks
Congruent angles are indicated by (check all that applies):
- Single arcs
- Double arcs
- Triple arcs
These markings help to visually distinguish congruent parts in geometric figures.