Jenna and Alex's Geometry Crossword

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Across
  1. 2. the sixteenth letter of the Greek alphabet,never ending number
  2. 5. lines,planes,surfaces,or objects side by side having the same distance continuously between them, they never intersect
  3. 6. the exact middle point
  4. 7. the amount of space that a substance or object occupies, or that is enclosed within a container
  5. 9. angle of 90°, as in a corner of a square or at the intersection of two perpendicular straight lines
  6. 10. four-sided plane rectilinear figure with opposite sides parallel
  7. 14. figures identical in form, but different in size
  8. 15. each angular point of a polygon, polyhedron, or other figure
  9. 17. branch of mathematics concerned with the properties and relations of points, lines, surfaces, solids, and higher dimensional analogs
  10. 19. principal or horizontal axis of a system of coordinates, points along which have a value of zero for all other coordinates
  11. 21. a straight line from the center to the circumference of a circle or sphere
Down
  1. 1. is straight no bends, has no thickness, and extends in both directions without end
  2. 3. the continuous line forming the boundary of a closed geometric figure
  3. 4. branch of mathematics dealing with the relations of the sides and angles of triangles and with the relevant functions of any angles
  4. 8. a number which produces a specified quantity when multiplied by itself
  5. 11. angles having a common vertex and a common side
  6. 12. the extent or measurement of a surface or piece of land
  7. 13. a quadrilateral with only one pair of parallel sides
  8. 16. any of a set of straight lines passing through one point
  9. 18. the secondary or vertical axis of a system of coordinates, points along which have a value of zero for all other coordinates
  10. 20. solid geometric figure whose two end faces are similar, equal, and parallel rectilinear figures, and whose sides are parallelograms