Geometry

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Across
  1. 3. rectangle circle
  2. 5. Oblique
  3. 6. supplementary
  4. 8. Degenerate
  5. 9. angle
  6. 10. decagon
  7. 11. square line
  8. 14. prism
  9. 15. square Quadrilateral
  10. 16. Perpendicular
  11. 18. Collinearity
Down
  1. 1. Lines
  2. 2. Vertex ScaleneTriangle
  3. 4. IntersectingLineSegments
  4. 7. diameter rhombus
  5. 8. kite
  6. 9. acute chord
  7. 12. polygon
  8. 13. Circumference
  9. 17. scalene