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# Interpreting trigonometric graphs in context

When a trigonometric function models a real-world relationship, we can assign meaning to its midline, amplitude and period. Created by Sal Khan.

## Want to join the conversation?

• I thought the practice from the last chapter said that midline is 1/4 of a period, so 4 x 15 right? AHhhhh i keep confusing myself
• No, 4x10, because the midline is x=15 and max is x=25, min is x = 5. 25-15 = 10, and 15-5=10 as well.

Generally its 4 x difference between x of midline and x of the immediate next min or max.
• I didn't understand why the mid-line represents the center of rotation?
• The midline represents the average of the max_Yvalue, min_Yvalue
• Oh mah lawd
• I never knew that Ferris wheels went that fast...
• Is the period always the same?
(1 vote)
• Not necessarily. Functions can have different periods