Question

Solve 25th number with steps​

Answer 1

Take a look at the image provided first.

So we need to find  [($\pi$$R^{2}$ - $\pi$$r^{2}$) / $\pi$$r^{2}$] * 100 %  ---------- I

Wiz, Difference in area / initial area,

Now, we need to find a values of r and R.

Since, circumference of circle wiz 2$\pi$a changes from 4$\pi$ to 8$\pi$,

So, 2$\pi$r = 4$\pi$ => r = 2 cm

Now, 2$\pi$R = 8$\pi$ => R = 4 cm

Now, area of the circles are,

$\pi$(4) and $\pi$(16) $cm^{2}$ respectively.

Now, we substitute this in I,

So, our increase is ,

(12/4)100 %

3 % increase in the area.

Answer 2

Answer:

Step-by-step explanation: