Question

A copper wire when bent in the form of a square encloses an area of 121cm square . If the same wire is bent into the form of a circle , find the area of the circle .​

Answer 1

Thanks for your question...

Your required answer :

Given :

2πr = 44

Area of square = 121 cm²

a² = 121

a = 11 cm

Perimeter = 4 × side

4 × 11

44 cm

Solution :

.

$2 \times \frac{22}{7} \times r = 44 \\ \\ r = 7 \: cm$

Now area :

$\frac{22}{7} \times 7 \times 7 \\ \\ 22 \times 7 \\ \\ 154 \: cm {}^{2}$

Brainliest Please

Answer 2

The radius of the pillars are 1/2 m

The height is 4.5 m

The number of pillars is 14

The CSA of one pillars =2πrh

2×22/7×1/2×45/10

99/7 m²

The CSA of all the pillars =14×99/7

=198m²

We will not paint the pillars 15 cm from the top and bottom

so the total are that will not be painted is =30 cm

30cm= 30/10⁴ =3/10³ m²

The are the should be painted is =198- 0.003 m²

=197.997 m²

The cost is = 25×197997/1000

= 4949.925 RS

The cost of painting is 4949.925 RS