document.write( "Question 617651: prove that an exterior angle of a triangle is equal to the sum of the remote interior angles... how do i do this? \n" ); document.write( "

Algebra.Com's Answer #388478 by solver91311(24713) $\"\"$ $\"About$

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\n" ); document.write( "\n" ); document.write( "If

, and

are the three interior angles of any triangle, and

is the exterior angle at the vertex

, then you know two things. First the sum of the three interior angles is 180 degrees and

and

are supplementary (by definition of exterior angle of a polygon). So

. So:\r
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\n" ); document.write( "\n" ); document.write( "John
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\n" ); document.write( "My calculator said it, I believe it, that settles it
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$\"The$

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