Final answer:
At the first quarter phase of the Moon, we see half of its illuminated side from Earth, which appears as a crescent shape.
Step-by-step explanation:
A quarter moon is one-fourth of the way through its cycle. At this phase, we see half of the Moon's illuminated side from Earth. The Moon appears as a crescent shape, with one side of the Moon illuminated and the other side dark. This phase is also known as the first quarter phase.