Why is half of a circle called a semi-circle, but half of a sphere called a hemisphere?

Answer by Justin Rising:

"semi" and "hemi" are respectively Latin and Greek prefixes meaning "half".  The word "circle" is of Latin origin, so it gets the Latin prefix, but the word "sphere" is of Greek origin, so it gets the Greek prefix.

Why is half of a circle called a semi-circle, but half of a sphere called a hemisphere?

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