a,b,c are lengths of triangle
a+b>c
c+a>b
b+c>a
2. The difference of any two sides of triangle is always less than 3rd side.
a-b<c
b-c<a
c-a<b
3.sum of two sides greater than 3rd side, difference of two sides less than 3rd side.
Sum of two sides > third side > Difference of two sides
4. Greater angle has greater side to it opposite and smaller Angel has smaller side opposite to it.
5. Sum of internal angle of a triangle is 180 degrees.
6. Sum of external angle of a triangle is 360 degrees.
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