Question

c) A thin wire 20 centimetres long is formed into
rectangle. If the width of this rectangle is
4 centimetres, what is its length​

Answer 1

Answer:

length = 6cm

Step-by-step explanation:

Let the length be l and breadth be b

2(l+b) = 20

Now, b=4

So, 2(l+4) = 20

This implies   2l +8 = 20

So,   2l = 12

 l = 6cm

Therefore, the length will be 6cm.

Hope it helps

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Answer 2

Step-by-step explanation:

Let the length of the rectangular wire be ' l cm'.

Perimeter of thin wire = 20 cm (given)

Perimeter of rectangular wire = 2(l+b)

=> 20 cm = 2(l+b) [Since, the thin wire is formed into a rectangle]

=> 20/2 = l + 4cm

=> 10 cm = l + 4cm

Therefore, l = 10cm - 4cm

= 6cm

Hope it helps :)