Why are there 180 degrees in a triangle?

I just dont get it

Answers
because 2 triangles make a square or a rectangle which is 360 degrees and half of a rectangle/square = 180 degrees
ellsbells7
27 April 2011
because 2 triangles make a square or a rectangle which is 360 degrees and half of a rectangle/square = 180 degrees
ellsbells7
27 April 2011
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