Riverdance is a show which presents the traditional dance form called in a glamorous new package, performed by a large and proficient young cast with a high degree of energy and precision.

Irish step dancing

Explanation:

Riverdance is a theatrical show which is composed mainly of traditional Irish music and dance.

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