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June 20th, 2011, 11:37 AM  #1 
Newbie Joined: Jun 2011 Posts: 4 Thanks: 0  I'm a parent going back to school part 2
Can someone break this simple math down for me? It's been a long time since I was in school. The area of a circle with a diameter of 240mm is: The multiple choice answers are cm2. 
June 20th, 2011, 11:46 AM  #2 
Newbie Joined: Jun 2011 Posts: 4 Thanks: 0  Re: I'm a parent going back to school part 2
I have the answer key because I'm studying for a placement exam; the answer is 452.16cm2 and I was just wondering how you get that answer.

June 20th, 2011, 12:47 PM  #3 
Newbie Joined: Jun 2011 Posts: 4 Thanks: 0  Re: I'm a parent going back to school part 2
Figured it out on my own, thanks anyways.

June 20th, 2011, 01:02 PM  #4 
Global Moderator Joined: Dec 2006 Posts: 20,624 Thanks: 2077 
Since ? isn't exactly 3.14, that's not quite right. The area is ?d²/4, where d is the diameter.

June 21st, 2011, 01:27 PM  #5  
Newbie Joined: Jun 2011 From: United States Posts: 11 Thanks: 0  Re: I'm a parent going back to school part 2 Quote:
 

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