Two- and Three-Dimensional Shapes

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Across
  1. 2. A triangle with one obtuse angle
  2. 4. A quadrilateral whose opposite sides are parallel and of equal length
  3. 8. A non-polyhedron with no bases and 1 curved surface
  4. 10. polygon with six sides and six angles
  5. 12. A polygon with four sides and four angles
  6. 13. A non-polyhedron that has 1 circular base and 1 curved surface
  7. 17. A non-polyhedron that has 2 same-size circular bases and 1 curved surface
  8. 19. A polygon with three sides and three angles
  9. 20. A quadrilateral with two pairs of parallel sides, four sides of equal length, and four right angles
Down
  1. 1. A triangle with no equal sides
  2. 3. A quadrilateral with exactly one pair of parallel sides
  3. 5. A quadrilateral with two pairs of parallel sides and four sides of equal length
  4. 6. A triangle with 2 equal sides
  5. 7. A triangle with one right angle
  6. 9. A quadrilateral with two pairs of parallel sides, two pairs of sides of equal length, and four right angles
  7. 11. A triangle with 3 equal, or congruent sides
  8. 14. A polygon with five sides and five angles
  9. 15. A polyhedron that has two same size and same shape polygons as bases
  10. 16. A polyhedron with only one base
  11. 18. A triangle with three acute angles