GNU Collaborative International Dictionary of English

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  1.       

    Pentagon , n. [Gr. πεντάγωνον; πεντα- (see Penta-) + γωνία angle: cf. L. pentagonium, F. pentagone.] (Geom.) A plane figure having five angles, and, consequently, five sides; any figure having five angles.
    1913 Webster
    Regular pentagon, a pentagon in which the angles are all equal, and the sides all equal.
    1913 Webster

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