Question

9. The area of rectangular field is 290 m² and its length is 21 m.
(i) Find the breadth of the plot.
(ii) Find the cost of fencing it at the rate of 16.50 per metre.
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Answer 1

Answer:

Given :-

• Area of field = 290 m²
• Length = 21 m

To Find :-

• Breadth
• Cost of fencing at 16.50 per m

Solution :-

As we know

$\frak \pink{Area = l \times b}$

$\sf : \implies \: 290 = 21 \times b$

$\sf : \implies \: \dfrac{290}{21} = b$

$\sf : \implies \: 13.80 \approx \: b$

Now,

Let's find Total cost

$\frak \red{Perimeter = 2(l + b)}$

$\sf : \implies \: Perimeter = 2(13.80 + 21)$

$\sf : \implies \: Perimeter = 2(44.80)$

$\sf : \implies \: Perimeter = 89.6$

$\frak \pink{Total \: cost \: = 89.6 \times 16.5}$

$\sf \ratio \implies Total \: cost \: = 1478.4 \: rs$

Answer 2

Answer:-

Area of rectangular field = 290 m²

length of rectangular feild = 21

Breadth = ?

Area = l×b

= 290 = 21×6

b= 290=13.8m

21

Cost of fencing is Rs.16.50 per metre

Perimeter of feild

=2(l+b)=2(21+13.8)

Cost of fencing =55.8×16.50=Rs.920 Ans