Bonus Crossword

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Across
  1. 2. Shape, both pairs of opposite sides are parallel
  2. 3. It's to _____ your brains
  3. 4. Parallelogram whose adjacent sides are perpendicular
  4. 7. If Anika was a triangle she'd be an acute triangle
  5. 9. The only question students looking forward to answering on a test
  6. 10. Method of solving a linear equation
  7. 12. Shortest distance from a _____ to a line
  8. 13. A combination of the retro arcade games asteroid and centipede
  9. 14. a2 + b2 = c2
  10. 18. Most misspelt word on the E.Q.A.O.
Down
  1. 1. 5/4 people have trouble with fractions
  2. 2. Line perpendicular to a line in a triangle passing through it's midpoint
  3. 5. A function as well as a delicious snack
  4. 6. A line that joins the vertex of a triangle to the midpoint of the opposite side
  5. 8. A website for when you're stuck
  6. 11. The act of texting, eating and watching tv with an open textbook nearby
  7. 15. Where 3 altitudes of a triangle intersect
  8. 16. The perpendicular distance from a vertex to an opposite side
  9. 17. Mental Abuse To Humans
  10. 19. A line segment joining two points on a curve