Chapter six crossword puzzle

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Across
  1. 4. a four-sided, or quadrilateral, geometric figure in which all four sides are of the same length and each of the two pairs of opposite sides are parallel to each other
  2. 6. a type of quadrilateral, whose opposite sides are equal and parallel
  3. 8. a line that passes through two very specific points on a triangle: a vertex, or corner of a triangle, and its opposite side at a right, or 90-degree, angle
  4. 12. the center of mass of a geometric object of uniform density.
  5. 14. the point where the triangle's three perpendicular bisectors intersect
  6. 15. the point where all three altitudes of the triangle intersect
  7. 17. a line that evenly cuts an angle into two equal halves
  8. 18. quadrilaterals that have two parallel sides and two non-parallel sides
Down
  1. 1. a line that bisects another line segment at a right angle, through the intersection point
  2. 2. a triangle in which all three sides have the same length, and all three angles are equal
  3. 3. a simple quadrilateral with two pairs of parallel sides
  4. 5. a four-sided regular polygon which is also known as a quadrilateral with four equal sides
  5. 7. a quadrilateral with reflection symmetry across one of its diagonals
  6. 9. a point which is at the same or equal distance from two given points
  7. 10. a line segment joining a vertex to the midpoint of the opposite side
  8. 11. the point where three bisectors of the interior angles of a triangle intersect
  9. 13. a line segment joining two vertices of a polygon or polyhedron
  10. 16. having all or corresponding angles equal.