| Answer | Crossword Clue |
|---|---|
| decagonally | DECAGONAL, of a plane figure, having ten sides |
| decagonal | of a plane figure, having ten sides |
| trapezia | any rectilinear quadrilateral plane figure not a parallelogram; such a figure of which no two sides are parallel; such a figure having two parallel and two nonparallel sides |
| pentagon | plane figure having five sides |
| chiliagon | (Greek) a plane figure of a thousand angles and sides |
| chiliagons | CHILIAGON, (Greek) a plane figure of a thousand angles and sides |
