Geometry crossword puzzle

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Across
  1. 2. 2 sides of a triangle are congruent
  2. 6. side by side and they never intersect
  3. 8. LA= pl
  4. 10. A= bh
  5. 13. half of a circle
  6. 14. LA= 2πrl
  7. 15. two sides perpendicular to form 90 degree angle
  8. 16. opposite side/hypotenuse
  9. 18. adjacent side/hypotenuse
  10. 19. first and last terms in a proportion
Down
  1. 1. a line from one side of the circle to the other side
  2. 3. identical on both sides
  3. 4. y = mx + b
  4. 5. A= ½ d1 + d2
  5. 7. A line from the center of a circle to its perimeter
  6. 9. A= bh
  7. 11. middle of a line
  8. 12. A= πr²
  9. 17. LA= πrl
  10. 20. middle terms of a proportion