Notice that the measure of the exterior angle of this regular pentagon is 72°, which is equal to the measure of the central angle (i. e., the one at the center,
between the dashed lines). Do you think this is ALWAYS the case with all regular
polygons? Why or why not?

my apex says that it is false

the diagram shows you   triangle def with de=4, df=9 and de≠df≠ef.

the sum of the lengths of two triangles' sides are always greater than the length of the third side:

substitute sides lengths:

then 5< ef< 13 (option 3 is true).

def is a scalene triangle with all sides of different lengths (option 5 is true, option 2 is false).

answer: correct choices are 1, 3 and 5