The sum is a sphere, a 3-dimensional object, not a 2-dimensional one. It may appear to be a circular disk and during a solar eclipse it is possible that at some stage exactly half of the solar disk will be visible.
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Sunset or sunrise.
All triangles inscribed in a semicircle with one side of the triangle being the diameter of the semicircle are right triangles.
The cross section of the Ram hemi is a semicircle
a sphere
The diameter of the semicircle will be twice the radius.