Similarly, the Positive Small (PS) fuzzy variable should
carry a non-zero membership value for any member that lies
in the range of 0o to 180o on the arc where a membership
value of unity (sin π/2) should be at the start of the second
quarter of the arc. The members that belong to the fuzzy
variable Positive Medium (PM) have a non-zero
membership value in the range of 90o to 270o on the arc.
The final fuzzy variable Positive Big (PB) would covers all
the members that lie in the range of 180o to 270o where the
largest member in the universe should have a unity
membership value, i.e. |sin(3π/2)|. Hence, the fuzzy
variables will be defined as: