In Volume terms: (p=pi by the way)
V=4/3pr3 or V=4pr3/3 so it is this, time a quarter or 1/4 which is 4pr3/12 which is equal to pr3/3
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It is almost always about 50%. One half of the lunar sphere is always facing the sun and is therefore illuminated. How much of that illuminated part we, on earth, can see is a different question.
Sphere is one syllable: sphere.
No, just one face on a sphere
It is one fourth.
semi-sphere