Shapes

6. a parallelogram with opposite equal acute angles, opposite equal obtuse angles, and four equal sides.
8. eight-sided polygon or 8-gon.
10. a plane figure with four straight sides and four right angles, especially one with unequal adjacent sides, in contrast to a square. quadrilateral with reflection symmetry across a diagonal.
11. round plane figure whose boundary (the circumference) consists of points equidistant from a fixed point (the center). having a rounded and slightly elongated outline or shape like that of an egg.
14. polygon with three corners and three sides.
15. a triangle, chevron, or concave kite, usually affixed to a line segment or rectangle
16. six-sided polygon.
18. five-sided polygon or 5-gon.

1. seven-sided polygon or 7-gon
2. a plane figure with four equal straight sides and four right angles.
3. geometrical figure consisting of two intersecting lines or bars, usually perpendicular to each other.
4. three-dimensional solid object bounded by six square faces, facets, or sides, with three meeting at each vertex.
5. a square put on its side, resembling a diamond. On the top, two semi-circles are placed.
7. one-dimensional locus of points that forms half of a circle
9. a 2D shape known for its lunar form.
12. a polygon having ten sides or a ten-sided polygon.
13. type of non-convex polygon.
17. nine-sided polygon or 9-gon.