quadrilateral

3. two pairs of adjacent side of the same lenght
5. opposites sides are parallel.
6. having four sides, four angles, and four vertices.
7. has equal sides (marked "s") and every angle is a right angle (90°)
8. a four-sided shape where every angle is a right angle (90°).
11. a pair of opposite sides parallel.
13. quadrilaterals are not simple quadrilaterals in which the pair of non-adjacent sides intersect.

1. of a quadrilateral the length of its boundary.
2. has opposite sides parallel and equal in length.
4. a four-sided shape where all sides have equal length (marked "s").
9. opposite sides are parallel.
10. Quadrilaterals Both the diagonals of a quadrilateral are completely contained within a figure.
12. Quadrilaterals at least one of the diagonals lies partly or entirely outside of the figure.