Quadrilaterals

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Across
  1. 1. the ___ interior angles of a parallelogram are equal.
  2. 4. cointerior angles on parallel lines are ___
  3. 6. a heptagon has ____ sides
  4. 7. a quadrilateral with only one pair of parallel lines is called a ____.
  5. 9. the sum of the __ angles in a polygon add up to 360
  6. 13. angles that add up to 90 are called ___ angles.
  7. 14. the diagonals of a square bisect the interior angles.
  8. 15. a _____ has diagonals that meet at 90.
  9. 16. _____ angles on a straight line are supplementary
  10. 17. alternate angles on ________ lines are equal
Down
  1. 2. a parallelogram has two pairs of ___ sides parallel
  2. 3. the diagonals of a ___ meet at 90.
  3. 5. corresponding angles on parallel lines are ____
  4. 8. the ___ angles of a triangle add up to 180
  5. 9. a triangle with three equal sides is called a ______ triangle
  6. 10. a ____ has interior angles equal to 90.
  7. 11. the interior angles in a _____ add up to 540
  8. 12. a polygon with six sides is called a ____