Geometry terms

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Across
  1. 2. a position in space
  2. 5. the length of a straight line through the center of a circle
  3. 8. The line on a graph that runs horizontally (left-right) through zero
  4. 10. an angle less than 90 degrees but more than 0 degrees
  5. 12. lying in the same plane
  6. 17. a three-sided regular polygon
  7. 18. is a line that passes through two very specific points on a triangle
  8. 19. the length of the closed curve of a circle
Down
  1. 1. a horizontal slope
  2. 3. an angle greater than 90 degrees but less than 180 degrees
  3. 4. a point equidistant from the ends of a line or the extremities of a figure
  4. 6. a straight line from the center to the perimeter of a circle
  5. 7. changing a shape using, turn, flip, slide, or resize
  6. 9. either of two equal and opposite angles formed by the intersection of two straight lines
  7. 11. A geometric figure which touches only the sides (or interior) of another figure.
  8. 13. The 90 degree angle between two perpendicular lines
  9. 14. a triangle whose interior angles are all acute
  10. 15. being everywhere equidistant and not intersecting
  11. 16. a polygon with four equal sides and four right angles
  12. 20. the part of a straight line considered as originating at a point on the line and as extending in one direction from that point