Poets will pay particular attention to the length, placement, and grouping of lines and stanzas. ... Setting those two lines aside gives emphasis to their content, so whatever message is being sent will be given more importance. Another aspect of the structure of poems is the rhythm, which is the beat of the poem
She can fit 3 squares along the 10 inch side and 6 squares along the 18 inch side. When you multiply 3 by 6 you get 18. The answer is not 20 because you cannot fit 20 3x3 squares.