Chapter 6-7

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Across
  1. 2. - at equal distances
  2. 5. - a line segment through a vertex and perpendicular to a line containing the side opposite the vertex
  3. 7. - a line segment joining two vertices of a polygon or polyhedron, when those vertices are not on the same edge
  4. 8. - the arithmetic mean position of all the points in the surface of the figure
  5. 10. - a quadrilateral with reflection symmetry across a diagonal
  6. 11. - a quadrilateral with four right angles
  7. 15. - a line that bisects another line segment at a right angle, through the intersection point
  8. 16. - a parallelogram with opposite equal acute angles, opposite equal obtuse angles, and four equal sides
  9. 17. - the point of intersection between the three perpendicular bisectors of the triangle's sides
  10. 18. - a four-sided plane rectilinear figure with opposite sides parallel
Down
  1. 1. - having all its sides of the same length
  2. 3. - a plane figure with four equal sides and four right angles
  3. 4. - a quadrilateral with only one pair of parallel sides
  4. 6. - a line that splits an angle into two equal angles
  5. 9. - the Nagel point of the medial triangle (the triangle whose vertices are the midpoints of the sides) and therefore lies inside this triangle
  6. 12. - having equal angles
  7. 13. - the point where all three altitudes of the triangle intersect
  8. 14. - a line segment joining a vertex to the midpoint of the opposite side