Geometry wordplay

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Across
  1. 2. the sum of the lengths of the sides of a polygon
  2. 4. having the same measure
  3. 5. the intersection of two non collinear rays at a common endpoint
  4. 7. the common endpoint of two rays
  5. 10. bisector, a ray that divides an angle into two congruent angles
  6. 13. points that lie on the same line
  7. 18. the distance around a circle
  8. 19. angle an angle with a degree measure greater than 90 and less than 180
  9. 21. the point of a segment exactly halfway between the endpoints of the segment
  10. 23. point that lie in the same plane
  11. 24. angle an angle with a degree measure less than 90
  12. 25. a closed figure formed by a finite number of coplanar segments called sides
  13. 27. angle, two adjacent angles formed by two intersecting lines
  14. 28. area, the sum of the areas of all faces and side surfaces of a three-dimensional figure
Down
  1. 1. angles, two angles with measures that have a sum of 90
  2. 2. a location in a figure represented by a dot
  3. 3. any set of straight lines that pass through one point
  4. 4. a polygon for which there is no line that contains both a side of the polygon and a point in the interior of the polygon
  5. 6. a unit of measure used in measuring angles and arcs
  6. 8. a polygon for which there is a line containing a side of the polygon that also contains a point in the interior of the polygon
  7. 9. a measure of the amount of space enclosed by a three-dimensional figure
  8. 11. a flat surface made up of points that has no depth and extends indefinitely in all directions
  9. 12. a basic undefined term of geometry, made up of points and has no thickness or width
  10. 14. angle, an angle with a degree measure of 90
  11. 15. polygon, a polygon with all congruent sides
  12. 16. the number of square units needed to cover a surface
  13. 17. segment a measurable part of a line that consists of two points called endpoints
  14. 20. the rays of an angle
  15. 22. angles, two angles with measures that have a sum of 180
  16. 26. the length of the segment between two points