2004 AMC 10A Problems/Problem 21
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Problem
Two distinct lines pass through the center of three concentric circles of radii 3, 2, and 1. The area of the shaded region in the diagram is
of the area of the unshaded region. What is the radian measure of the acute angle formed by the two lines? (Note:
radians is
degrees.)

Solution
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See also
| 2004 AMC 10A (Problems) | ||
| Preceded by Problem 20 | Followed by Problem 22 | |
| 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 | ||





