2004 AMC 10A Problems/Problem 19
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Contents
[hide]Problem
A white cylindrical silo has a diameter of 30 feet and a height of 80 feet. A red stripe with a horizontal width of 3 feet is painted on the silo, as shown, making two complete revolutions around it. What is the area of the stripe in square feet?
Solution
The cylinder can be "unwrapped" into a rectangle, and we see that the stripe is a parallelogram with base and height . Thus, we get
Video Solution
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See also
2004 AMC 10A (Problems • Answer Key • Resources) | ||
Preceded by Problem 18 |
Followed by Problem 20 | |
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All AMC 10 Problems and Solutions |
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