Difference between revisions of "2006 AMC 8 Problems/Problem 7"
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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>. | 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>. | ||
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+ | {{AMC8 box|year=2006|num-b=6|num-a=8}} |
Revision as of 15:58, 21 November 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
.
2006 AMC 8 (Problems • Answer Key • Resources) | ||
Preceded by Problem 6 |
Followed by Problem 8 | |
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All AJHSME/AMC 8 Problems and Solutions |