Question

How to find answer please give me answer

Answer 1

↑ Here is your answer ↓
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(1)

$2 \pi r = 88$

$\pi r = 44$

$r_1 = 44/ \pi$

(2)

$2 \pi r = 66$

$\pi r = 33$

$r_2 = 33/ \pi$

Minus r2 from r1,

$44/ \pi - 33/ \pi$

$11/ \pi$

$= 3.5cm$

Answer 2

Hey friend, Harish here.

Here is your answer:

Given that,

Circumference of the concentric rings are 88cm & 66 cm Respectively,

To find, 

The width of the ring.

Solution,

Let the radius be r₁ for 88cm , & r₂ for 66cm circle.

Then, We know that.

$Circumference = 2 \pi r$

⇒ $88 = 2 \pi r_1$

⇒ $88 = 2\times \frac{22}{7} \times r_1$

⇒ $r_1 = \frac{88\times 7}{2\times 22} = 2\times 7 =14\ cm$

Then,

$66 = 2 \pi r_2$

⇒ $66 = 2\times \frac{22}{7} \times r_2$

⇒ $r_2 = \frac{66\times 7}{2\times 22} = \frac{6}{4}\times 7 = 1.5 \times 7 =10.5\ cm$

Now we know that, 

$Width\ of\ Ring = r_1 - r_2 = 14 - 10.5 = 3.5cm$

Therefore the width of the ring is 3.5cm. (OPTION - i)
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Hope my answer helps you.