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Mathematics 15 Online
OpenStudy (anonymous):

PLEASE HELP! WILL GIVE MEDAL AND FAN!

OpenStudy (anonymous):

one sec, let me post the question

OpenStudy (anonymous):

?

OpenStudy (anonymous):

OpenStudy (anonymous):

I think it's the first option

OpenStudy (anonymous):

Could you please explain to me how you got that?

OpenStudy (anonymous):

@15Twilight

OpenStudy (anonymous):

I think since the other 2 angles of the triangles are congruent, then the 3rd angle must also be congruent, which proves that the triangles are congruent

OpenStudy (anonymous):

but then it can also be the third option

OpenStudy (anonymous):

@SolomonZelman @satellite73 @Sophhh786 @THEKIDREAL can you guys help?

OpenStudy (anonymous):

its a

OpenStudy (anonymous):

How did you get a?

OpenStudy (solomonzelman):

lets do this. If I tell you that you must be given statement X to prove statement X, will you laugh at me?

OpenStudy (anonymous):

no

OpenStudy (anonymous):

no

OpenStudy (solomonzelman):

like if I say that in order to prove that 2=2, you must know that 2=2. is that like a legit "proof" ?

OpenStudy (solomonzelman):

that's in not a "proof" , correct?

OpenStudy (anonymous):

yeah, it's not

OpenStudy (solomonzelman):

So, look at the second requirement in option A. You can see that it is exactly the thing that you want to (know how to) prove.

OpenStudy (solomonzelman):

oh no never mind, I misread it

OpenStudy (solomonzelman):

I'll do some labeling on the picture. it will take some time.

OpenStudy (anonymous):

ok

OpenStudy (solomonzelman):

but by proving two triangles to be similar you don't show that they are for sure congruent.

OpenStudy (solomonzelman):

So I am thinking to exclude option A.

OpenStudy (anonymous):

Well the question is asking which one if necessary to be a given piece of information

OpenStudy (anonymous):

I don't quite understand why exclude option A

OpenStudy (solomonzelman):

it is not enough. and you are asked what must you be given to prove your statement (the congruence of 2 triangles)

OpenStudy (anonymous):

oh ok

OpenStudy (solomonzelman):

this is option B, I labeled it.

OpenStudy (solomonzelman):

this thing is hard for me, because I am not able to see what each option says right away. only after a small reading.

OpenStudy (anonymous):

but if those corresponding lines are congruent, that doesn't mean that line segments GH and HI are congruent, does it?

OpenStudy (solomonzelman):

I am not saying B is the answer. I just want to get the entire picture of all of the choices.

OpenStudy (anonymous):

oh ok

OpenStudy (anonymous):

any ideas what the answer could be?

OpenStudy (anonymous):

I'm thinking to exclude options a and c because congruent angles doesn't mean that the triangles are congruent, they could be similar but with congruent angles.

OpenStudy (solomonzelman):

I was thinking that maybe C

OpenStudy (solomonzelman):

|dw:1419019094799:dw|

OpenStudy (solomonzelman):

so this is what we will know:|dw:1419019197324:dw|the triangles are only similar and not congruent.

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