Quadrilaterals

1234567891011121314
Across
  1. 6. a plane figure with at least three straight sides and angles
  2. 7. at least one of the diagonals lies partly or entirely outside of the figure
  3. 8. is the line segment connecting the midpoints of two sides of a triangle
  4. 9. a shape having three sides and three corners
  5. 10. is a closed shape and type of polygon that has four sides, four vertices and four angles
  6. 13. has exactly one parallel side
  7. 14. has two pairs of adjacent sides of the same length
Down
  1. 1. are not simple quadrilaterals in which pair of non-adjacent sides intersect
  2. 2. has no parallel sides
  3. 3. a parallelogram with right angles
  4. 4. has 4 congruent sides and 4 right angles, and they also have two sets of parallel sides
  5. 5. is the total space occupied by the figure
  6. 6. it is the total distance covered by the boundary of a 2d shape
  7. 11. has two pairs of parallel sides
  8. 12. a parallelogram with congruent sides