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

- anonymous

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

- jamiebookeater

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- anonymous

This is the picture

##### 1 Attachment

- anonymous

19) is incorrect. What about
|dw:1440008761096:dw|

- anonymous

Is 19 the only one that is incorrect?

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- anonymous

29) is incorrect. What about
|dw:1440008841552:dw|

- anonymous

What?

- anonymous

Sorry. *20

- anonymous

I believe 21 is correct.

- anonymous

Are they all wrong?

- anonymous

And 22?

- anonymous

I believe 22 is correct.
|dw:1440009068239:dw|

- anonymous

Sketch for 21.
|dw:1440009258663:dw|

- anonymous

so.......

- anonymous

They are all B

- anonymous

?

- anonymous

Correct

- anonymous

All good?

- anonymous

yep

- anonymous

Can you correct my work again?

- anonymous

Post a new queation and I'll be glad to have a look at it.

- mathstudent55

|dw:1440009490508:dw|

- anonymous

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.

- mathstudent55

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.

- mathstudent55

In problem 20, the answer is "Suffucient".

- mathstudent55

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.

- anonymous

B
A
B
B

- anonymous

Is correct?

- anonymous

So @mathstudent55 , I suppose you would also agree that the following quadrilateral is parallelogram?
|dw:1440010612059:dw|

- mathstudent55

@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.

- mathstudent55

@OM14forever
Yes, that is correct.
19 B
20 A
21 B
22 B

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