Question

The width of a rectangle is 3 feet and the area is 18 square feet , what is perimeter of the rectangle?

Answer 1

`\mathrm{18ft.}`

Explanation:

`\mathrm{We\ have,}\\\mathrm{Width\ of\ rectangle(b)=3ft.}\\\mathrm{Area\ of\ rectangle(A)=18\ sq.\ ft}\\\mathrm{Let\ the\ length\ of\ the\ rectangle\ be\ 'l'\ and\ its\ perimeter\ be\ 'P'.}\\\mathrm{Now,}\\\mathrm{Area\ of\ rectangle=l* b}\\\mathrm{or,\ 18=l* 3}\\\mathrm{or,\ l=6ft.}\\\mathrm{So\ the\ length\ of\ rectangle\ is\ 6\ feet.}\\\mathrm{Finally,\ perimeter\ of\ rectangle\ is\ given\ by\ the\ formula:}\\\mathrm{P=2(l+b)=2(6+3)=2(9)=18ft.}\\`

`\mathrm{\therefore Perimeter\ of\ rectangle\ is\ 18\ feet.}`

Answer 2

18 ft

Explanation:

area = length × width

length = area/width

length = 18 ft² / 3 ft

length = 6 ft

perimeter = 2(length + width)

perimeter = 2(6 ft + 3 ft)

perimeter = 2(9 ft)

perimeter = 18 ft