November 13th, 2010, 11:01 PM  #1 
Newbie Joined: Nov 2010 Posts: 4 Thanks: 0  Help me! Find the area
Find the area of the crescentshaped region(called a lune) bounded by arcs of circles with radii r and R(see the figure) http://www.mathhelpforum.com/mathhelp/ ... titled.png Thank you very much 
November 14th, 2010, 03:00 AM  #2 
Senior Member Joined: Oct 2010 From: Changchun, China Posts: 492 Thanks: 14  Re: Help me! Find the area
clue: "area of pink" + "area of green"= 'half area of the smaller circle", so you need to get the area of pink. [attachment=0:1f44t6p0]Untitled.PNG[/attachment:1f44t6p0] 
November 14th, 2010, 03:46 AM  #3 
Newbie Joined: Nov 2010 Posts: 4 Thanks: 0  Re: Help me! Find the area
Can you help me do it?

November 14th, 2010, 03:47 AM  #4  
Newbie Joined: Nov 2010 Posts: 4 Thanks: 0  Re: Help me! Find the area Quote:
Thank you very much.  
November 14th, 2010, 05:48 AM  #5 
Senior Member Joined: Oct 2010 From: Changchun, China Posts: 492 Thanks: 14  Re: Help me! Find the area 

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