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http://www.regentsprep.org/regents/math/geometry/gp6/Lisosceles.htm

well u gotta prove the height is connected to the mid point of the base too :P

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You could even use a 4-45-90 triangle.
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45-45-90 **

I am still so confused...

@Michele_Laino I dont understand any of this...

okay here ill show u how i d do it i think this is a simple way

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yo dan, you're going to confuse her with the alpha and beta :p

step #3 the two triangle ACH and BCH are congruent by the criterion SAS being the side CH in common

triangles*

Yeah.... I dont get that at all...alpha and beta?

I know, but I dont have a place to put a picture, It only allows me to submit text...

Maybe an attach file button?

step #4 in particular angles CAH and CBH are congruent each other
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Ok, let me try to explain to you what Dan said as the Alpha and Beta confused you.

Please do...

use my proof its nice :) no theorems needed

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So we have a triangle. Do you understand up until here?

Yes I understand that we have a triangle

Ok, have you learned what reflection is in math?

ok well thats not true I used the SSS theorem xD

Yes

so lets reflect this triangle that we have along our imaginary x-axis
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still with me?

yes

So now lets put these two triangles together and combine them:

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ok so how does this help prove that the base angles are congruent?

so lets put values for our sides

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so that means:
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I dont understand that....

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Omg that other website helps me so much! Thank you so much

haha, no problem :)

Anytime :)