The sum of the lengths of any two sides of a triangle must be greater than the third side. if a triangle has one side that is 8 cm and a second side that is 4 cm less than twice the third side, what are the possible lengths for the second and third sides?

Good afternoon, 

First side= 8cm 
Third side= x
Second side= 2x-4

We know that the sume of the lenghts of any two sides must be greater than the third side, so:



Third side= x                        ;         where: x>4 or (4,+infinity)
                Second side= 2x-4              ;         where: x>4 or (4,+infinity)

Idon’t understand this but 90