3. Chopin's Nocturne in E Flat Major from this unit and his Prelude in E Minor from Part I (Elements) exhibit the technique of , a "slight holding back or pressing forward of tempo" in which one note is given more time than the notated rhythm calls for and the next note is given less.

Rubato is the answer.

Explanation:

Rubato means slightly holding back or pressing forward of tempo.

perimeter = 2l +2w, divide total perimeter by 2 for total length of 1 side and 1 width

172/2 = 86 (  total for 1 side and 1 width)

86-24 = 62 (since length is 24 ft longer subtract 24 then divide by 2 for width)

62/2 = 31

width = 31 feet

length = 31 +24 = 55 feet

check: 31*2 = 62, 55*2 = 110,  110+62 = 172