Geometry

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Across
  1. 6. A specific case where the conjecture is wrong
  2. 10. The arc length of a circle
  3. 11. (Draw pic)angle-bisector
  4. 14. A line that intersects 2 or more coplanar lines at differnt points
  5. 16. (draw pic)angle
  6. 17. The point where all 3 altitudeds of the triangle intersect
  7. 18. A shape with 10 sides
  8. 19. (draw pic)rectangle
  9. 20. An unproven statement based on observations
Down
  1. 1. (draw pic)acute angles
  2. 2. if not A then not B
  3. 3. Three or more points that lie on the same plane
  4. 4. squareroot (x2-x1)+(y2-y1)^2
  5. 5. (Draw pic)consecutive angles
  6. 7. the number of unit squares that cover the surface of a closed figure
  7. 8. The length of the outline of a shape
  8. 9. (draw pic)colinear points
  9. 12. (draw pic)centroid
  10. 13. a2+b2=c2
  11. 15. The equidistant from both endpoints