Answer :
Answer:
The difference of z and y must be 2x.
Step-by-step explanation:
we know that
The measure of the external angle is the semi-difference of the arches it covers
so
[tex]x=\frac{1}{2}[z-y][/tex]
Isolate the difference of z and y
[tex](z-y)=2x[/tex]
therefore
The difference of z and y must be 2x.