Why are three-dimensional models useful for understanding the lunar phases?

New moon, quarter moon, full moon are what we call the lunar phases. These are consequences of the motions of the Sun, Earth and moon. Three dimensional models are useful because the face of the moon that catches the light of the Sun depending on their position at any given time could be depicted well. Circular models would be the best visuals for the lunar phases.

The true options are:

-The inequality should be written as 2.50c less than or equal to 500.

-The circle is closed

-The arrow points right

Hope this helps!! :)