Mark's Birthday Crossword

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Across
  1. 2. A proven proposition in geometry or algebra
  2. 5. Handlebar control that lets you unleash horsepower
  3. 8. What we are doing for the birthday guy
  4. 10. The man of the hour, celebrating 65
  5. 11. One who crafts minds, often with chalk and patience
  6. 14. Knowledge hub with bells and desks
  7. 15. Integers evenly divisible by a given number
  8. 17. Rectangular array used in linear algebra
  9. 18. Hard material often used in snowmobile runner tips
  10. 19. Branch of mathematics concerned with shape and space
Down
  1. 1. Essential cranial safeguard on icy trails
  2. 3. Unassuming fasteners with sharp points
  3. 4. Handlebar control that lets you unleash horsepower
  4. 5. A proven proposition in geometry or algebra
  5. 6. Framing element hidden behind drywall
  6. 7. Powered sled for winter terrain
  7. 9. Structured outline of educational content
  8. 12. Horizontal support that distributes load beneath a floor
  9. 13. Structural skeleton supporting walls and roof
  10. 16. These are blown out with a birthday wish