Question 239626:  I dont understand clearly how to do geometry proofs working with isosceles triangles and the rest of chapter 4 in geometry...can you please help me? 
 Answer by College Student(505)      (Show Source): 
You can  put this solution on YOUR website! Hello!  I'll try to summarize some things here for you. 
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As we you know, all triangles have 3 sides forming 3 angles.   
The sum of all angles must always add up to 180 degrees. 
In the case of isosceles triangles, 2 of its sides and 2 of its angles must equal to each other.  It does not matter their measurement, as long as both are the same. 
There is one kind of isosceles triangle that we call a "right isosceles triangle".  This triangle has one angle of 90 degrees and the other 2 are exactly 45 degrees each. 
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If you need to see some illustrations, I recommend: http://www.mathsisfun.com/triangle.html 
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I hope this helps you.  Otherwise, please keep posting questions. 
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