| Answer | Crossword Clue |
|---|---|
| heptagons | A plane figure with seven straight sides and angles |
| hexagons | A plane figure with six straight sides and angles |
| pentagons | A plane figure with five straight sides and five angles |
| triangle | A plane figure with three straight sides and three angles |
| triangles | A plane figure with three straight sides and three angles |
| polygons | A plane figure with at least three straight sides and angles, and typically five or more |
| polygon | A plane figure with at least three straight sides and angles, and typically five or more |
| diamonds | A figure with four straight sides of equal length forming two opposite acute angles and two opposite obtuse angles; a rhombus |
| quadrangle | a plane figure with four angles (and therefore four sides) |
| quadrangles | QUADRANGLE, a plane figure with four angles (and therefore four sides) |
