Difference between revisions of "2010 AMC 10A Problems/Problem 5"
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If the circumference of a circle is <math>24\pi</math>, the radius would be <math>12</math>. Since the area of a circle is <math>\pi r^2</math>, the area is <math>144\pi</math>. The answer is <math>\boxed{E}</math>. | If the circumference of a circle is <math>24\pi</math>, the radius would be <math>12</math>. Since the area of a circle is <math>\pi r^2</math>, the area is <math>144\pi</math>. The answer is <math>\boxed{E}</math>. | ||
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| + | == See Also == | ||
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| + | {{AMC10 box|year=2010|ab=A|num-b=4|num-a=6}} | ||
Revision as of 18:36, 1 January 2012
Problem 5
The area of a circle whose circumference is 
is 
. What is the value of 
?
Solution
If the circumference of a circle is , the radius would be 
. Since the area of a circle is 
, the area is 
. The answer is 
.
See Also
| 2010 AMC 10A (Problems • Answer Key • Resources) | ||
| Preceded by Problem 4 |
Followed by Problem 6 | |
| 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 | ||
| All AMC 10 Problems and Solutions | ||
