The area of a circle is 20cm^2. What is the circumference in centimeters? Express in terms of Pie.

Question

SsTDOGRednek · Answer

Could anyone help me with this? I don't understand it. I searched it up and I still don't understand it.

Indagurity · Answer

Isn't the equation for circumference like something involving pi

SsTDOGRednek · Answer

Yeah, it would be a number then the PI symbol after it

kristen000021 · Answer

Using the formulas
A=πr2
C=2πr
Solving for C
C=2√(πA)=2·√(π·20)≈15.85331cm

C=15.85 cm

SsTDOGRednek · Answer

I sure hope this is right because I have to put these down for noted lol

SsTDOGRednek · Answer

I'll double check it with teh calculator and then the teacher just to make sure because I need  to have the right notes

jhonyy9 · Answer

@kristen000021 wrote:

Using the formulas A=πr2 C=2πr Solving for C C=2√(πA)=2·√(π·20)≈15.85331cm C=15.85 cm

from formula of area you need calcule the r $$A=pir^2 $$ $$r=\sqrt{A/\pi }$$ and now you can use this value of r to calcule the circumference

SsTDOGRednek · Answer

r is radius right?

kristen000021 · Answer

yea

SsTDOGRednek · Answer

Alr, good to know. I need to remember that.