2010 AMC 8 Problems/Problem 18
Revision as of 23:32, 15 May 2012 by WolfOfAtlantis (talk | contribs) (Created page with "The ratio of AD to AB is 3:2 and AB=30 inches. <math>If 30=2, then x=3. x=45. </math> The area of the rectangle is <math>45*30= 1350</math>. The semicircles, when combined, have...")
The ratio of AD to AB is 3:2 and AB=30 inches.
The area of the rectangle is 
.
The semicircles, when combined, have the area of a regular circle.
Radius is 15 (
, for the record). Area of a circle is 
, so it's equal to 225
is equivalent to 
[1]
The image given in the test is given above for reference.
Answer is $\box{C: 6:\pi}$ (Error compiling LaTeX. Unknown error_msg)
![[1]](http://i.imgur.com/5qEb2.png){kind=link}