prove that sum of the interior angle of triangle will be in 180
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If ABCD is a triangle than <( ABC + <( BCA + <) CBA = 180.
Draw a line through point A and B. Draw line b through point c and parallel to line a. Since line a and b are parallel <(BAC = B'CA and <( ABC = <(BCA.
Draw a line through point A and B. Draw line b through point c and parallel to line a. Since line a and b are parallel <(BAC = B'CA and <( ABC = <(BCA.
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