geometry crossword puzzle

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Across
  1. 4. a 2-D shape with four sides hence termed as a quadrilateral
  2. 6. a four-sided polygon in which the opposite sides are parallel and equal to each other
  3. 8. a line that passes through the vertex or corner of a triangle.
  4. 12. the centre point of the object.
  5. 14. the intersection point of the perpendicular bisectors of sides of a triangle.
  6. 15. the point where the three altitudes of a triangle meet
  7. 17. a ray, segment, or line that divides a given angle into two angles of equal measures.
  8. 18. a quadrilateral with only one pair of parallel sides.
Down
  1. 1. a line that bisects a line segment in two equal parts and makes an angle of 90 degrees at the point of intersection
  2. 2. having all its sides of the same length.
  3. 3. a quadrilateral with two pairs of parallel sides
  4. 5. a quadrilateral with four sides and four vertices.
  5. 7. a quadrilateral with reflection symmetry across a diagonal.
  6. 9. at equal distances.
  7. 10. a line segment coming from one vertex to the midpoint of the opposite side.
  8. 11. the point of intersection of all the three interior angle bisectors of the triangle.
  9. 13. a line segment connecting two non-adjacent vertices of a polygon.
  10. 16. having equal angles.