An Etymological Dictionary of Astronomy and Astrophysics
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Polygons that have an equal number of sides, and all the corresponding sides and angles are congruent. However, they can be in a different location, rotated or flipped over.

→ congruent; → polygon.

A one-dimensional closed figure consisting of a series of points, each of which is called a → vertex, and the line segments, called → sides, joining the vertices. Polygons of three sides are called → triangles, and of four sides → quadrilaterals.

→ poly- + → -gon.

Polygons that are exactly the same shape, but can be different sizes.

→ similar; → polygon.