1. The problem is to understand the full moon phase, which visually appears as a complete circle of light on the moon's surface. 2. The full moon occurs when the Earth is between the Sun and the Moon, and the Moon's surface facing Earth is fully illuminated by the Sun. 3. This phase can be represented graphically as a circle, where the illuminated part is 100% of the visible moon. 4. The key formula to understand phases of the moon involves the angle between the Sun, Earth, and Moon, but for the full moon, this angle is approximately 180 degrees. 5. In simple terms, the full moon phase means the moon is fully lit from our perspective, appearing as a bright circle. 6. The graph of the full moon phase is a circle shape, centered on the right side (center-right) of the viewing area, representing the fully illuminated moon. Final answer: The full moon phase is represented by a full circle of light, indicating the moon is fully illuminated as seen from Earth.