1) Angle sum property for a triangle is 360 degree 2) The exterior angle property for a triangle sum of opposite angles of a triangle is equal to the exterior angle  3) There are 3 altitudes for a triangle  4) There is 1 median for a triangle 5) If the sum of all two sides of the triangle is less than third side forms a triangle 6) The sum of any two sides of a triangle must be greater than the third side of a triangle  7) For an obtuse-angled triangle altitude lies outside the triangle 

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