Geometry crossword book

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Across
  1. 3. a line connecting the midpoints between two sides of a triangle
  2. 4. A shape with 8 sides
  3. 6. a four-sided plane rectilinear figure with opposite sides parallel
  4. 9. a quadrilateral with four sides and four vertices
  5. 10. The middle
  6. 11. a figure which is formed by two rays or lines that shares a common endpoint
  7. 13. when both the hypothesis and conclusion are negated
  8. 14. the perpendicular drawn from the vertex of the triangle to the opposite side
  9. 17. a closed two-dimensional polygon with six sides
  10. 18. The distance around a shape
  11. 19. the amount of space occupied by a two-dimensional figure
  12. 20. an angle of exactly 90 degrees
Down
  1. 1. an angle whose vertex point has a value of 180 degrees
  2. 2. the centre point of the object
  3. 5. a statement that is assumed to be true based on basic geometric principles.
  4. 7. Two or more lines that lie in the same plane and never intersect each other
  5. 8. two lines that meet or intersect each other at right angles
  6. 12. a pair of adjacent supplementary angle
  7. 15. An angle which is measuring less than 90 degrees
  8. 16. The converse of a conditional statement is created when the hypothesis and conclusion are reversed.