Problem: 2004 AMC 10 #19
Source:
February 1, 2007
geometryrectangleMATHCOUNTSparallelogram
Problem Statement
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?[asy]
size(250);defaultpen(linewidth(0.8));
draw(ellipse(origin, 3, 1));
fill((3,0)--(3,2)--(-3,2)--(-3,0)--cycle, white);
draw((3,0)--(3,16)^^(-3,0)--(-3,16));
draw((0, 15)--(3, 12)^^(0, 16)--(3, 13));
filldraw(ellipse((0, 16), 3, 1), white, black);
draw((-3,11)--(3, 5)^^(-3,10)--(3, 4));
draw((-3,2)--(0,-1)^^(-3,1)--(-1,-0.89));
draw((0,-1)--(0,15), dashed);
draw((3,-2)--(3,-4)^^(-3,-2)--(-3,-4));
draw((-7,0)--(-5,0)^^(-7,16)--(-5,16));
draw((3,-3)--(-3,-3), Arrows(6));
draw((-6,0)--(-6,16), Arrows(6));
draw((-2,9)--(-1,9), Arrows(3));
label("", (-1.375,9.05), dir(260), fontsize(7));
label("", (0,15), N);
label("", (0,-1), NE);
label("", (0, -3), S);
label("", (-6, 8), W);[/asy]