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From the outside of the bow to the outside of the stern
The length of the boat.
Arc measure is the number of radians. Two similar arcs could have the same arc measure. Arc length is particular to the individual arc. One must consider the radius of the arc in question then multiply the arc measure (in radians) times the radius to get the length.
No. Except that in a REGULAR polygon, all the sides must be of the same length and all the angles of the same measure.
You must first decide what you want to measure about the rice grains: their length, circumference, mass, weight, volume, color, elasticity, etc.