Geometry

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Across
  1. 1. space occupied by a 3-dimensional shape
  2. 4. 4 congruent sides
  3. 8. space occupied by a flat shape or the surface of an object
  4. 10. Flipping an image across an axis on a graph
  5. 11. 3-dimensional triangle
  6. 13. 4 right angles
  7. 14. co-planar straight lines that do not intersect at any point
  8. 16. Vertical line on a graph
  9. 19. straight line that goes from each side of a circle while touching the center
Down
  1. 2. Angle(s) above 90 but lower than 180
  2. 3. straight line segment whose endpoints both lie on a circular arc
  3. 5. set of straight lines passing through one point
  4. 6. portion cut off in a line
  5. 7. the space (usually measured in degrees) between two intersecting lines
  6. 9. Starting point (0,0) on a graph
  7. 12. Horizontal line on a graph
  8. 15. 4 right angles with 4 congruent sides
  9. 17. Angle(s) below 90
  10. 18. middle of a line segment
  11. 20. straight line from the center to the circumference of a circle or sphere