Geometry

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Across
  1. 3. Part of a circle enclosed by two radii and an arc
  2. 7. Triangle with all the sides equal
  3. 8. Polygon with 8 sides
  4. 9. Lines which never meet
  5. 10. The amount of space occupied
Down
  1. 1. Triangle with all the sides unequal
  2. 2. Triangle with two sides equal
  3. 4. Angles which measure between 90 and 180 degrees
  4. 5. The amount of surface occupied by a closed figure
  5. 6. Quadrilateral with exactly one pair of opposite sides parallel