Question

Plz answer this question guys urgent

if the radius of a circle is increased by 1 cm then the ratio of new circumference and the new diameter will be what? ​

Answer 1

Let the radius of original circle be r

therefore radius of new circle = r+1

area of original circle =

$\pi {r}^{2}$

$= \frac{22}{7} \times {r}^{2}$

area of new circle

$= \pi \times {(r + 1)}^{2}$

$= \pi \times ( {r}^{2} + 1 + 2r)$

$\frac{area \: of \: original \: circle}{area \: of \: new \: circle}$

$= \frac{\pi {r}^{2} }{\pi \times ( {r}^{2} + 1 + 2r) }$

$= \frac{ {r}^{2} }{ {(r + 1)}^{2} }$

hope it helped you sister

Answer 2

Answer:

Let radius of circle =r,

According to question, radius of circle is increased by 1 unit.

Then, radius of circle r+1

Now, diameter of circle is D=2(r+1)

And Circumference of circle C=2×π×radius =2×π(r+1)

Now, ratio of circumference and Diameter of the circle,

DC=2(r+1)2π(r+1)=1π

C:D=π:1

Hence, this is the answer.

Explanation:

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