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Hard answer as the question could be read as when did people know that the earth is round, or how do people know that the earth is round. Historically, many people have been credited with the theory of spherical earth, dating back to ancient Greece. Many philosophers of Ancient Greece spoke of earth being round, but most often the credit is given to Pythagoras. The explanation that the world wasn't flat was by observing changes in altitude and the placement of the stars in different locations as they moved around the pole.
3/4 of the earth
18 feet.
5 feet
19 feet!
"3 feet round" is not clearly defined: is that the radius, the diameter, or the circumference?
An eight-foot wide round table is 50.27 square feet.
round about 22.9658793
The circumference is 188 feet.
24 feet long.
There is about 1,267,200,000 feet.