To find the period
⇒ let's define what the period is
Definition of Period: the interval of time between successive occurrences of the same state in an oscillatory or cyclic phenomenon
Based on the definition:
⇒it states that we must look for how long it takes the function to
complete one cycle of repetition
In this graph: it takes
to complete one period or one cycle of repitition
Answer:
Hope that helps!