September 2nd, 2009, 02:57 PM  #1 
Newbie Joined: Sep 2009 Posts: 22 Thanks: 0  Geometry or weights?
Two parallel shelves, each exactly 138 cm long, have exactly 32 cm of space between them. A circular hoop is placed between the shelves. The hoop's crosssection is a 2.5 cm square. The hoop barely touches the top shelf, and rests on the corners of the bottom shelf, as shown . If the hoop's density is 7.85 grams per cubic centimetre, what is the hoop's total mass?

September 2nd, 2009, 02:59 PM  #2 
Newbie Joined: Sep 2009 Posts: 22 Thanks: 0  Re: Geometry or weights?
i don't know if the image is showing or not but here is the link http://yfrog.com/6ccircleshelvesp 
September 2nd, 2009, 04:07 PM  #3 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,472 Thanks: 884 Math Focus: Elementary mathematics and beyond  Re: Geometry or weights?
Here's a start: sagitta properties.


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