Question

A rectangular field is to be fenced on three sides,leaving a side of 20cm uncovered.if the area of the feld is 680m2,how many metre of fencing is required?

Answer 1

$one \: side = 20 \: cm = 0.2 \: m \\ other \: \: side = \frac{680}{0.2} = 3400 \: m \\ \\ fencing \: \: required = 2 \times 3400 + 0.2 \\ = 6800.2 \: m$