Question

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

Answer 1

Answer:

length of one side is 20 m and area is 680 m

2

⇒ Length of other side =

20

680

=34 m

Now, length of fencing required for the three sides =34+34+20 = 88 m

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Answer 2

ANSWER ⤵️

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 m