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yes you can take a long board on a plane.
Normally 10 hours.
No, take a semicircle, it is a plane figure and is open. Or a parabola is also open and a plane figure.
The answer depends on how fast the plane is flying.
A milligram (mg) is one one-thousandth of a gram. That is, it takes 1000 milligrams to equal one gram. So, 500 milligrams is one-half gram.