Difference between revisions of "2006 AMC 8 Problems/Problem 7"
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== Solution == | == Solution == | ||
| − | Using the formulas of circles, <math> C=2 \pi r </math> and <math> A= \pi r^2 </math>, we find that circle Y has a radius of 4 and circle Z has a radius of 3. Thus, the order from smallest to largest radius is <math> \boxed{\textbf{(B)}\ Z, X, Y} </math>. | + | Using the formulas of circles, <math> C=2 \pi r </math> and <math> A= \pi r^2 </math>, we find that circle <math> Y </math> has a radius of <math> 4 </math> and circle <math> Z </math> has a radius of <math> 3 </math>. Thus, the order from smallest to largest radius is <math> \boxed{\textbf{(B)}\ Z, X, Y} </math>. |
Revision as of 19:43, 6 September 2011
Problem
Circle 
has a radius of 
. Circle 
has a circumference of 
. Circle 
has an area of 
. List the circles in order from smallest to largest radius.
Solution
Using the formulas of circles, 
and 
, we find that circle has a radius of 
and circle has a radius of 
. Thus, the order from smallest to largest radius is 
.
