The phases of the moon can be described using the phase angle , determined by the sun, the moon, and the Earth, as shown in the figure. Because the moon orbits Earth, changes during the course of a month. The area of the region A of the moon, which appears illuminated to an observer on Earth, is given by , where R = 1,080 mi is the radius of the moon. Approximate A for the following position of the moon: A)A = 2,606,488 mi² B)A = 686,643 mi² C)A = 939,611 mi² D)A = 232,115 mi² E)A = 171,661 mi²

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The Answer of The phases of the moon can be described using the phase angle , determined by the sun, the moon, and the Earth, as shown in the figure. Because the moon orbits Earth, changes during the course of a month. The area of the region A of the moon, which appears illuminated to an observer on Earth, is given by , where R = 1,080 mi is the radius of the moon. Approximate A for the following position of the moon: A)A = 2,606,488 mi² B)A = 686,643 mi² C)A = 939,611 mi² D)A = 232,115 mi² E)A = 171,661 mi²

The Phases of the Moon Can Be Described Using the Phase