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March 22nd, 2013, 09:52 AM  #1 
Newbie Joined: Mar 2013 Posts: 4 Thanks: 0  How does the text book come to its answer
Hi, I am trying to understand how they get 162.5mm as the answer. When I put this into the highlighted formula, I do not end up with 25? I am trying to get R on its own. Luke 
March 22nd, 2013, 10:20 AM  #2  
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1038  Re: How does the text book come to its answer Quote:
I calculated it; ended up with SQRT(.6336 / 24) = ~.16248 .16248 / 1000 = 162.5 (rounded) Ya'll ok now?  
March 22nd, 2013, 10:30 AM  #3 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,958 Thanks: 1146 Math Focus: Elementary mathematics and beyond  Re: How does the text book come to its answer 
March 22nd, 2013, 11:07 AM  #4 
Newbie Joined: Mar 2013 Posts: 4 Thanks: 0  Re: How does the text book come to its answer
Thank you both for the replies, it all makes sense now 
March 22nd, 2013, 04:13 PM  #5  
Global Moderator Joined: Dec 2006 Posts: 20,921 Thanks: 2203  Quote:
 
March 22nd, 2013, 04:25 PM  #6  
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1038  Re: Quote:
 

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