True or false: the sum of any two sides of a triangle are longer than the third side of the same triangle.

If we talk of interior angles,then yes.
e.g. a triangle with all 3 sides with 60*
so 60 + 60 = 180
and the third side (angle) is 60 so :
60 is not equal to 180.
except in the case of right angle triangle.
90 ( third angle ) = 60 + 30 ( angle 1 + 2)