Question

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

Answer 1

$lenght = \frac{area}{breadth} = \frac{680}{20} = 34m$
$meter \: of \: fencing = (34 \times 2) + 20$
$68 + 20 = 88$
Therefore,88 meter of fencing is required.