Math project crossword puzzle

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Across
  1. 3. Uses rise over run.
  2. 5. The set of all points equidistant from the center.
  3. 8. All angles are equal.
  4. 9. Three acute angles of a right triangle.
  5. 11. All sides are equal.
  6. 12. Extends in opposite directions without end.
  7. 13. A closed figure with three or more lines.
  8. 15. A polygon with four sides.
  9. 17. Has exactly two congruent sides.
  10. 18. figures that have the same shape and size.
  11. 19. A quadrilateral with both pairs of opposite side being parallel.
Down
  1. 1. A parallelogram with four congruent sides.
  2. 2. No sides are equal.
  3. 3. A parallelogram with four congruent sides and angles.
  4. 4. A parallelogram with four congruent right angles.
  5. 6. consists of two opposite rays.
  6. 7. The quotient of two Quantities.
  7. 10. A type of arc that makes up half a circle.
  8. 14. When two ratios are equal.
  9. 16. Formed by Three sides.