Hardest Math Puzzle

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Across
  1. 8. Overall measurement and dimensions of things
  2. 9. Study of numbers, shapes, logic, and quantity and arrangements
  3. 11. Four sided-polygon with all internal angles equal to 90 degrees
  4. 13. Form of objects that have boundary lines, angles, and surfaces
  5. 14. Where shapes faces meet
  6. 16. Illustrating a general rule
  7. 17. Mirror image of a shape
  8. 18. Closed figure with 12 sides and 12 angles
  9. 19. Result of adding numbers
Down
  1. 1. Polygon that has three edges and three vertices
  2. 2. Rule written with mathematical symbols
  3. 3. Angles that measure less than 90 degrees
  4. 4. A portion/part
  5. 5. Branch of mathematics that studies the angles,sizes,shapes,positions,and dimensions of things
  6. 6. Quadrilateral with two pairs of parallel sides
  7. 7. Measures 90 degrees
  8. 8. Line segment that joins two vertices in a shape
  9. 10. Closed two-dimensional polygon with 6 sides
  10. 12. Measure the same
  11. 15. Two lines that intersect each other at right angles