relationships in triangles

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Across
  1. 5. Bisector a line that splits an angle into two equal parts
  2. 6. a shape where opposite sides are parallel
  3. 7. quadrilaterals that have two parallel sides and two non-parallel sides
  4. 10. a four-sided regular polygon which is also known as a quadrilateral with four equal sides
  5. 11. the perpendicular line segment drawn from the vertex of the triangle to the side opposite to it
  6. 13. the point where the internal angle bisectors of the triangle cross
  7. 17. a sloping line that connects to the vertices of a shape
  8. 18. a quadrilateral with both pairs of opposite sides parallel and all sides the same length
Down
  1. 1. a two-dimensional geometrical shape whose sides are parallel to each other
  2. 2. the point where all three altitudes of the triangle intersect
  3. 3. the point at which the three perpendicular bisectors of the sides of a triangle intersect and which is the same distance from each of the three vertices of the triangle
  4. 4. Bisector a line segment which bisects another line segment at 90 degrees
  5. 8. being the same or equal distance
  6. 9. a line segment that joins vertices of triangles to the midpoints of opposite sides
  7. 12. when all sides of a shape are an equal length
  8. 14. when the angles within a shape are equal
  9. 15. the center point of an object
  10. 16. a quadrilateral with reflection symmetry across one of its diagonals