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1) Some of interior angles is 180 degree

2) Triangle inequality theorem:This theorem says that the sum of lengths of any 2 sides of triangle must be greater than the third side.

3) Relation b/w measurements of the sides & angles in a triangle:The largest interior angle & side are opposite to each other.The same rule applies for the smallest side & angle & the middle sized angle & side.

2. IF A LINE DIVIDES ANY TWO SIDES OF A TRIANGLE IN THE SAME RATIO, THEN THE LINE MUST BE PARALLEL TO THE THIRD SIDE.(

4.SUM OF THREE ANGLES OF A TRIANGLE IS 180