Final answer:
An angle with a vertex at Y can start at Y and extend in different directions: upward, downward, to the right, or to the left.
Step-by-step explanation:
An angle with a vertex at Y can be described in the following ways:
- Vertically upward in the coordinate system: This means that the angle starts at point Y and extends upwards.
- Vertically downward in the coordinate system: This means that the angle starts at point Y and extends downwards.
- Horizontally to the right side of the coordinate system: This means that the angle starts at point Y and extends to the right side of the coordinate system.
- Horizontally to the left side of the coordinate system: This means that the angle starts at point Y and extends to the left side of the coordinate system.