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Honors Geometry Section 4.6 (1) Conditions for Special Quadrilaterals

Honors Geometry Section 4.6 (1) Conditions for Special Quadrilaterals.

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Honors Geometry Section 4.6 (1) Conditions for Special Quadrilaterals

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  1. Honors Geometry Section 4.6 (1)Conditions for Special Quadrilaterals

  2. In section 4.5, we answered questions such as “If a quadrilateral is a parallelogram, what are its properties?” or “If a quadrilateral is a rhombus, what are its properties?” In this section we look to reverse the process, and answer the question “What must we know about a quadrilateral in order to say it is a parallelogram or a rectangle or a whatever?”

  3. What does it take to make a parallelogram?State whether the following conjectures are true or false. If it is false, draw a counterexample.

  4. If one pair of opposite sides of a quadrilateral are congruent, then the quadrilateral is a parallelogram.

  5. If one pair of opposite sides of a quadrilateral are parallel,thenthe quadrilateral is a parallelogram.

  6. If one pair of opposite sides of a quadrilateral are both parallel and congruent, then the quadrilateral is a parallelogram.

  7. If both pairs of opposite sides of a quadrilateral are parallel,thenthe quadrilateral is a parallelogram.

  8. If both pairs of opposite sides of a quadrilateral are congruent, then the quadrilateral is a parallelogram.

  9. If the diagonals of a quadrilateral bisect each other, then the quadrilateral is a parallelogram.

  10. The last 4 statements will be our tests for determining if a quadrilateral is a parallelogram.If a quadrilateral does not satisfy one of these 4 tests, then we cannot say that it is a parallelogram!

  11. What does it take to make a rectangle? State whether the following conjectures are true or false. If it is false, draw a counterexample.

  12. If one angle of a quadrilateral is a right angle, then the quadrilateral is a rectangle.

  13. If one angle of a parallelogram is a right angle, then the parallelogram is a rectangle.

  14. If the diagonals of a quadrilateral are congruent, then the quadrilateral is a rectangle.

  15. If the diagonals of a parallelogram are congruent, then the parallelogram is a rectangle.

  16. If the diagonals of a parallelogram are perpendicular , then the parallelogram is a rectangle.

  17. Statements 2 and 4 will be our tests for determining if a quadrilateral is a rectangle.Notice that in both of those statements you must know that the quadrilateral is a parallelogram before you can say that it is a rectangle.

  18. What does it take to make a rhombus? State whether the following conjectures are true or false. If it is false, draw a counterexample.

  19. If one pair of adjacent sides of a quadrilateral are congruent, then the quadrilateral is a rhombus.

  20. If one pair of adjacent sides of a parallelogram are congruent, then the parallelogram is a rhombus.

  21. If the diagonals of a parallelogram are congruent, then the parallelogram is a rhombus.

  22. If the diagonals of a parallelogram are perpendicular then the parallelogram is a rhombus.

  23. If the diagonals of a parallelogram bisect the angles of the parallelogram, then the parallelogram is a rhombus.

  24. Statements 2, 4 and 5will be our tests for determining if a quadrilateral is a rhombus.Notice that in each of these statements you must know that the quadrilateral is a parallelogram before you can say that it is a rhombus.

  25. What does it take to make a square? It must be a parallelogram, rectangle and rhombus.

  26. Examples: Consider quad. OHMY with diagonals that intersect at point S. Determine if the given information allows you to conclude that quad. OHMY is a parallelogram, rectangle, rhombus or square. List all that apply.

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