Geometry

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Across
  1. 3. a quadrilateral with only one pair of parallel sides
  2. 6. multiply this with the base to get the area
  3. 7. A Triangle with all three sides equal
  4. 8. Base x height = ?
  5. 11. A Triangle with all angles less than 90 degrees
  6. 15. The science of numbers
  7. 17. The space between two intersecting lines
  8. 18. A unit where 12 of these make a foot
  9. 19. A unit made up of 100 centimeters
Down
  1. 1. a point where 2 or more sides meet
  2. 2. A 3 sided polygon
  3. 4. a triangle with all angles equal
  4. 5. A line segment that forms part of a boundary
  5. 9. The same
  6. 10. The distance around all 4 sides
  7. 12. A Triangle with at least 2 sides equal
  8. 13. A triangle with one angle greater than 90 degrees
  9. 14. Multiply this with the height to get the area
  10. 16. A Triangle with one 90 degree angle