Difference between revisions of "2008 AMC 8 Problems/Problem 25"
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==Solution== | ==Solution== | ||
<cmath>\begin{array}{c|cc} | <cmath>\begin{array}{c|cc} | ||
− | \text{circle #} & radius & area \\ \hline | + | \text{circle \#} & \text{radius} & \text{area} \\ \hline |
1 & 2 & 4\pi \\ | 1 & 2 & 4\pi \\ | ||
2 & 4 & 16\pi \\ | 2 & 4 & 16\pi \\ |
Revision as of 20:07, 10 March 2015
Problem
Margie's winning art design is shown. The smallest circle has radius 2 inches, with each successive circle's radius increasing by 2 inches. Approximately what percent of the design is black?
Solution
The entire circle's area is . The area of the black regions is . The percentage of the design that is black is .
See Also
2008 AMC 8 (Problems • Answer Key • Resources) | ||
Preceded by Problem 24 |
Followed by Last Problem | |
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 AJHSME/AMC 8 Problems and Solutions |
The problems on this page are copyrighted by the Mathematical Association of America's American Mathematics Competitions.