How to simulate this periodic function?

Hey guys. I've got this periodic function which I need to simulate in Simulink but it is in radians and I don't know how to sim a function that is in radians:

f(θ)

=

(80/∏2) θ, -∏/2 ≤ θ ≤ ∏/2 (80/∏) - (80/∏2) θ, ∏/2 ≤ θ ≤ 3∏/2

Could anyone tell me how to convert this function into a time function?

Alternately, could anyone tell me how to simulate this function using the "Repeating Sequence" block in simulink??

Thank you all very much.

[Azzi Abdelmalek]

your function is not clear, rewrite it using pi, teta, ...