Math Crossword Puzzle

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Across
  1. 5. slope/ steepness of a line
  2. 6. it has numerator and denominator
  3. 8. a triangle with congruent opposite sides and base angles
  4. 10. the middle value in a set
  5. 11. a U-shaped curve
Down
  1. 1. triangles with same shape and proportion in size
  2. 2. longest side of a right triangle
  3. 3. a polygon with three sides
  4. 4. lines that never intersect
  5. 7. a solid with circle bases joined by a curved surface
  6. 9. a set of points equidistant from the center
  7. 12. an angle less than 90 degrees