Geometry

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Across
  1. 4. Angles that add to 90 degrees
  2. 6. Figures with the same shape but different size
  3. 8. Part of a line with two endpoints
  4. 9. Lines that intersect to form right angles
  5. 12. Chord passing through the center of a circle
  6. 15. Parallelogram with four right angles
  7. 18. Triangle with two equal sides
  8. 19. Longest side of a right triangle
  9. 21. Line that crosses two or more other lines
  10. 23. Angles that add to 180 degrees
Down
  1. 1. Quadrilateral with two pairs of parallel sides
  2. 2. Theorem relating sides of a right triangle
  3. 3. Distance from center to edge of a circle
  4. 5. Triangle with all sides equal
  5. 7. Figures with the same size and shape
  6. 10. Lines that never intersect and stay the same distance apart
  7. 11. Flat surface that extends infinitely
  8. 13. Quadrilateral with exactly one pair of parallel sides
  9. 14. Parallelogram with four equal sides
  10. 15. Part of a line with one endpoint and extends infinitely
  11. 16. Lines that are neither parallel nor intersecting (in 3D)VERTICAL Opposite angles formed by intersecting lines
  12. 17. Distance around a circle
  13. 20. Triangle with no equal sides
  14. 22. Curved portion of a circle's boundary