You didn't give the options for techniques, but I will explain to you what rhythm in a poem is.
Simply put, rhythm can be defined as the beat and velocity of a poem. Rhythm is created by a continuous pattern of 'stressed and unstressed' syllables in a line or verse of your poem. Rhythm can help to strengthen the application of words and ideas in a poem.
Answer:
I know some one that knows but is going to take a minute
Explanation:
