Question

The circumference of a circular field is
440 m. Find the cost of levelling the field
at the rate of 5 per sq. m.

Take pi =22/7

Firstly find it's area and then rate

cost of levelling is important

50 points are there plz answer​

Answer 1

Answer:

We have,

Circumference of a circular field is 440m.

radius=?

Area=?

Cost=?

Now,

Circumference=440

2πr=440

⇒πr=220

⇒r=   220/ π

​⇒r= 220/22/7  

​⇒r=7×220/22

​⇒r=7×10

 ⇒r=70m.

Its radius is =70m.

Area=πr square

Area= 22/7 x 70 x70  

Area=22×10×70

 

Area=15400 m square  

.

Cost of leveling

=15400×17.50

=269500

Hence, this is the required answer.

Answer 2

Answer:

77000rs.

Step-by-step explanation:

$circumference \: of \: circle =2 \pi r$

440 = 2 × 22 × r

7

r= 440×7

2 × 22

r = 10 × 7

r = 70m

$Area \: of \: field = \pi r^{2}$

= 22×70×70

7

= 22 × 700

$= 15400 {m}^{2}$

cost of levelling the field = area × cost (per sq.m.)

= 15400 × 5

= 77000rs.

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