# Thread: circle

1. ## circle

The circumference, in inches, of a certain circle is C, where . Which of the following is a possible area of the circle, in square inches?

i want solution for 100/pi

2. no can see images ...

3. here u go

4. Originally Posted by aeroflix
The circumference, in inches, of a certain circle is C, where . Which of the following is a possible area of the circle, in square inches?

i want solution for 100/pi
$\displaystyle |C-20.5| \le 0.5$

$\displaystyle -0.5 \le C-20.5 \le 0.5$

$\displaystyle 20 \le C \le 21$

$\displaystyle 20 \le 2\pi r \le 21$

$\displaystyle \frac{10}{\pi} \le r \le \frac{21}{2\pi}$

the area of a circle is $\displaystyle \pi r^2$ ...

$\displaystyle \frac{100}{\pi^2} \le r^2 \le \frac{21^2}{4\pi^2}$

$\displaystyle \frac{100}{\pi} \le \pi r^2 \le \frac{21^2}{4\pi}$

5. HOW DID THIS ONE http://www.mathhelpforum.com/math-help/JSREPL23962:;
BECOME THIS ONEhttp://www.mathhelpforum.com/math-help/JSREPL23962:;

6. Originally Posted by aeroflix
HOW DID THIS ONE http://www.mathhelpforum.com/math-help/JSREPL23962:;
BECOME THIS ONEhttp://www.mathhelpforum.com/math-help/JSREPL23962:;
link no work

???

7. nevermind skeeter. i get your solution! thanks, whats ur msn?

8. Originally Posted by aeroflix
nevermind skeeter. i get your solution! thanks, whats ur msn?
msn? sorry, not familiar with that acronym.