Geometry

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Across
  1. 6. angles an angle pair that equals 90 degrees
  2. 9. a nine-sided polygon
  3. 13. a line that divides something into two equal parts
  4. 15. points on the same line
  5. 16. angles an angle pair that equals 180 degrees
  6. 19. a point where the x and y axis meet in a coordinate plane
  7. 20. two angles with a common side but have no common interior points
Down
  1. 1. Angles an angle that measures less than 90 degrees
  2. 2. a polygon with four sides, vertices and corners
  3. 3. four parts in a coordinate plane
  4. 4. geometric elements of equal measure
  5. 5. the distance around 2D shape
  6. 7. two lines meeting or crossing at a point
  7. 8. the measure of the amount of space inside of a container measured in cubic units
  8. 10. a flat planar surface that forms part of a solid objects boundary
  9. 11. a Solid geometric feature whose end faces are equal
  10. 12. lines that never intersect
  11. 14. a eight-sided polygon
  12. 17. a precise location on a grid represented by a dot
  13. 18. Half of the diameter