Question

rectangular field is to be fenced on three sides leaving a sides of 20cm are covered if the area of the field is 680 m square how many metres of fencing is required?

Answer 1

length × breadth = area of rectangle

20 × breadth = 680
breadth = 680/20 = 34

As one side of 20 cm is uncovered

so metre of fencing required = 2B + L
= 2(34) + 20
= 68 +20
= 88