Maths - volume, area

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Across
  1. 1. A three-dimensional figure with six rectangular faces
  2. 2. The maximum amount something can contain, often used in terms of liquids
  3. 5. A shape with four equal sides and four right angles
  4. 7. A solid geometric figure with two identical ends and flat sides
  5. 10. The distance around the edge of a shape
  6. 12. A line segment connecting two non-adjacent vertices of a polygon
  7. 13. A shape with four equal sides and four right angles
  8. 14. A shape with three sides
  9. 17. A shape with opposite sides equal and four right angles
  10. 19. A set of values that show an exact position
  11. 20. The outer edge of an area or surface
Down
  1. 1. The distance around a circle
  2. 3. A measure of the surface covered by a shape
  3. 4. A triangle with two sides of equal length
  4. 6. A four-sided shape
  5. 8. A fixed reference line for the measurement of coordinates
  6. 9. A triangle with all sides and angles equal
  7. 11. A corner point where edges meet
  8. 15. The amount of space an object occupies
  9. 16. A shape where all sides are squares
  10. 18. The point (0,0) where the x-axis and y-axis intersect on a graph