The Collaborative International Dictionary
Regular hexagon
Hexagon \Hex"a*gon\, n. [L. hexagonum, Gr. ? six-cornered; "e`x six (akin to E. six) + ? angle.] (Geom.) A plane figure of six angles.
Regular hexagon, a hexagon in which the angles are all equal, and the sides are also all equal.
WordNet
regular hexagon
n. a hexagon with six sides of equal length
Usage examples of "regular hexagon".
Now, as six equal equilateral triangles placed together will form a regular hexagon, as shown, it is evident that the shaded pasture is just one-sixth of the complete area of a circle.