Math Challenge: Geometric Numbers Crossword!

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123456789101112131415161718
Across
  1. 6. The distance around the outside of a 2D shape.
  2. 8. A mathematical tool used to measure and construct angles.
  3. 9. The result of going down 5, up 8, then down 3 from zero.
  4. 10. The smallest multiple shared by two or more numbers (abbr.).
  5. 12. The amount of surface a 2D shape covers.
  6. 14. A number less than zero.
  7. 15. The largest factor shared by two or more numbers (abbr.).
  8. 17. An angle exactly 90 degrees.
  9. 18. A straight path extending infinitely in both directions.
Down
  1. 1. A geometric shape with all points equidistant from a central point.
  2. 2. A closed 2D shape with four equal sides and four right angles.
  3. 3. A number that is not prime.
  4. 4. A line that cuts a line segment into two equal parts at a 90-degree angle.
  5. 5. Adding 1/2 of a number to 1/4 of that number (Clue 2 from treasure hunt).
  6. 7. A number that is only divisible by 1 and itself.
  7. 11. A part of a line with two endpoints.
  8. 13. A part of a line with one endpoint, extending infinitely in one direction.
  9. 16. An angle greater than 90 degrees but less than 180 degrees.