GEOMETRY

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Across
  1. 4. the total space taken up by a flat (2-D) surface or shape of an object
  2. 5. a line touching circles or an ellipse at only one point
  3. 6. a point where two straight lines or rays meet
  4. 7. straight path that extends infinitely in both directions
  5. 8. lines that don't intersect
  6. 9. shape with 8 sides
  7. 10. closed two-dimensional figure in which the set of all the points in the plane is equidistant from a given point called “centre”
  8. 11. the side of a right triangle opposite the right angle. It is the longest side of any such triangle
Down
  1. 1. shape with 6 sides
  2. 2. 90 degrees
  3. 3. lines that intersect at a right angle
  4. 6. the degree of loudness or the intensity of a sound
  5. 8. represented by a dot