Question

Could you please help me with this problem?
@nikato

Answer 1

Just post the question so other people can help you :)

Answer 2

yeah

Answer 3

@SolomonZelman

Answer 4

I know option B is incorrect because it =92 , not 90 .

Answer 5

yeah, im not that prone to these 2 column geo proffs. simply because i dont recall names of things to properly set them up i spose.

Answer 6

Oh, no worries. Let's just hope @ganeshie8 joins us! :)

Answer 7

5 seems to not be reading well for me .... can you verify?

Answer 8

lol, fine, statement 5 yada yada ....

Answer 9

xob is fine, xoa seems off

Answer 10

how would you determine the measure of the angles in 5?

Answer 11

@amistre64 I believe the reason for 5 is incorrect, it is not 180.

Answer 12

all the options say 5 is incorrect, trying to determine why it is wrong is our objective

from my knowing simply how to solve for the angles, i see that they solved the xoa incorrectly. it should have been quite similar to their setup for xob.

Answer 13

180 - 2(23)

Answer 14

Yes, that is correct.
Does that mean that her reason for 5 is correct?

Answer 15

@amistre64

Answer 16

@lilia222
The value of XOA is correct, but for the reason given, the calculation is incorrect.
As @amistre64 pointed out, it should be along the same lines as XOB.
Sum of angles of a triangle should read (180-23-23), or for isosceles triangles, one \(could \) write equivalently 2(90-23), but writing 90+44 is pushing it, even the result is the same.
I see the rest of the proof reasonable.

Answer 17

Yea.
It should be written the same way as XOB.
Which would be 180-2x23=134

Also you can easily eliminate the other choices because they have 90
Which has NOTHING to do with "sum of interior angles is 180"