The area of a rectangular field is 147 sq. cm.  The length is 7 cm, then perimeter is?

56 cm 45 cm 36 cm 55 cm

56 cm

Area of the rectangle = l × b ⇒ 147 = 7 × b ⇒ b = 21 cm perimeter = 2 (l + b)                = 2(7 + 21 ) = 56 cm