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anonymous

  • one year ago

Please correct my answers. MEDAL AND FAN!!!!! 19. A 20. A 21. B 22. B

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  1. anonymous
    • one year ago
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    This is the picture

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  2. anonymous
    • one year ago
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    19) is incorrect. What about |dw:1440008761096:dw|

  3. anonymous
    • one year ago
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    Is 19 the only one that is incorrect?

  4. anonymous
    • one year ago
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    29) is incorrect. What about |dw:1440008841552:dw|

  5. anonymous
    • one year ago
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    What?

  6. anonymous
    • one year ago
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    Sorry. *20

  7. anonymous
    • one year ago
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    I believe 21 is correct.

  8. anonymous
    • one year ago
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    Are they all wrong?

  9. anonymous
    • one year ago
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    And 22?

  10. anonymous
    • one year ago
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    I believe 22 is correct. |dw:1440009068239:dw|

  11. anonymous
    • one year ago
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    Sketch for 21. |dw:1440009258663:dw|

  12. anonymous
    • one year ago
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    so.......

  13. anonymous
    • one year ago
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    They are all B

  14. anonymous
    • one year ago
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    ?

  15. anonymous
    • one year ago
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    Correct

  16. anonymous
    • one year ago
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    All good?

  17. anonymous
    • one year ago
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    yep

  18. anonymous
    • one year ago
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    Can you correct my work again?

  19. anonymous
    • one year ago
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    Post a new queation and I'll be glad to have a look at it.

  20. mathstudent55
    • one year ago
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    |dw:1440009490508:dw|

  21. anonymous
    • one year ago
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    There is no requirement in the question that the quadrilateral be convex. In a polygon with 4 angles, angles that are not consecutive can be considered to be opposite.

  22. mathstudent55
    • one year ago
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    Problem 20 states: two pairs of opposite angles are congruent You showed an example with a concave polygon with ONE pair of angles congruent. You have not shown a proper counterexample to dismiss the statement of problem 20.

  23. mathstudent55
    • one year ago
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    In problem 20, the answer is "Suffucient".

  24. mathstudent55
    • one year ago
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    Problem 19. Insufficient. Counterexample: an isosceles trapezoid. Problem 20. Sufficient. Problem 21. Insufficient. Counterexample: an isosceles trapezoid. Problem 22. Insufficient. Counterexample: a non-rhombus kite.

  25. anonymous
    • one year ago
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    B A B B

  26. anonymous
    • one year ago
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    Is correct?

  27. anonymous
    • one year ago
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    So @mathstudent55 , I suppose you would also agree that the following quadrilateral is parallelogram? |dw:1440010612059:dw|

  28. mathstudent55
    • one year ago
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    @ospreytriple In response to your last response: 1. These problems deal with convex polygons, so your figure is not illustrative of such a case. Even if you don't see any specific mention of it, we are dealing only with convex polygons. 2. More importantly, we are dealing with Problem 20. You even drew this figure (see below) when you were discussing problem 20. Problem 20 is about 2 pairs of opposite angles congruent, but your figure only shows one pair of congruent angles. That is why I said your figure was not a good counterexample for two pairs of opposite angles. |dw:1440036882588:dw| 3. With problem 19, about one pair of congruent angles, I definitely agree with you that that is insufficient info to prove the quadrilateral is a parallelogram.

  29. mathstudent55
    • one year ago
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    @OM14forever Yes, that is correct. 19 B 20 A 21 B 22 B

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