Question

Triangle Proofs! Will Give Fan And Medal!!

Answer 1

Use ΔABC below to answer the question that follows:



Which fact is not used to prove that ABC is similar to DBE?

The sum of angles A and B are supplementary to angle C.
Segments AC and DE are parallel.
AB is a transversal line passing AC and DE.
Angle B is congruent to itself due to the reflexive property.

Answer 2

@ganeshie8 @nikato can you help?

Answer 3

@iambatman

Answer 4

@Luigi0210 @perl can someone please help

Answer 5

@timo86m @bibby

Answer 6

@ganeshie8

Answer 7

@jim_thompson5910

Answer 8

post any work or thoughts you have about this one

Answer 9

well I was thinking on eliminating AB is a transversal line passing AC and DE. since the transversal is DE I think

Answer 10

draw two parallel lines

Answer 11

the transversal line is a line that cuts through the two parallel lines

Answer 12

So then It would be true?

Answer 13

"AB is a transversal line passing AC and DE."

is that true? if it is true, is it useful info?

Answer 14

Yes, since it is what creates the two triangles that we are trying to prove are similar

Answer 15

Its true

Answer 16

Im not sure about is it is useful tho

Answer 17

well idk about that reasoning, but you do use that transversal to show that

angle BDE = angle BAC

Answer 18

Okay, I was looking at the proof and saw that the reflexive property wasnt used so I was thinkng on eliminating that one

Answer 19

I mean using that as my answer, not eliminating

Answer 20

And since the transversal is useful then that can be elimnated as an answer choice since the question asks which is NOT used

Answer 21

so have those 3 left

Answer 22

Yes

Answer 23

Im thinking that the answer would be about the reflexive property? I looked at a proof and saw that it wasnt used @jim_thompson5910

Answer 24

why wouldn't it be used?

Answer 25

I just looked at the proof on the lesson and saw it wasnt used

Answer 26

well angle B is definitely congruent to itself, and that is used because you need 2 pairs of angles to be congruent to show the triangles are similar

Answer 27

oh okay, i see

Answer 28

Woud AC parallel to DE be needed?

Answer 29

you tell me

Answer 30

do you think it's useful info?

Answer 31

Well I dont think it is useful. @jim_thompson5910

Answer 32

why is that?

Answer 33

Because you can already tell just by looking at the picture. But at the same time it is needed for the transversal

Answer 34

yeah if you use the transversal to show something like

angle BDE = angle BAC

then the lines need to be parallel (and it is useful info)

Answer 35

As you said earlier, we only need two angles to prove them similar so would the answer be A since it is talking about a third angle?

Answer 36

two pairs of angles, not 2 angles

Answer 37

Well since we have said that the other three choices are important then the last choice left would be A

Answer 38

yes, choice A is a true statement

BUT

it's not relevant here

Answer 39

I see that it is true, I just wasnt sure which was irrelevant. Thank you for all of your help c:

Answer 40

np

Answer 41

It was right btw :D