Quadrilaterals

123456789101112
Across
  1. 2. Points lying on the same line
  2. 6. The line segment joining the ___________ of any two sides is __________ to the third side and is ______ of it.
  3. 7. The diagonals of a _________ bisect each other and are equal
  4. 8. A diagonal of a parallelogram divides it into two ___________ triangles
  5. 11. A plane having four sides
  6. 12. The line segment joining the ___________ of any two sides is __________ to the third side and is ______ of it.
Down
  1. 1. The line segment joining the ___________ of any two sides is __________ to the third side and is ______ of it.
  2. 3. Opposite angles of a parallelogram are ________
  3. 4. A quadrilateral whose diagonals are perpendicular bisectors of each other.
  4. 5. A quadrilateral with opposite sides equal
  5. 9. A parallelogram is an isosceles ____________
  6. 10. ___________ angles of a parallelogram are supplementary