'hemi' means 'half' and 'sphere' means 'round ball', so, a hemisphere would be a shape like half a coconut, eggshell, or anything else that is shaped like half a round ball. On a globe of earth, we have northern, southern, eastern and western hemispheres.
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There are a great many things in the world that can be shaped like a hexagon. Stop signs can for example.
Some roleplaying game die and puzzles such as the Rubik's Cube are shaped like tetrahedrons.
a ice cream cone!:)
12 sided die