Tree and vine riddle
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There is a tree 20 feet high, with a circumference of 3 feet. A vine starts at the base of the tree and winds around the tree 7 times before reaching the top. How long is the vine? 
When you unwind the vine you basically get a right-angled triangle with a base of 7 * 0.9144 meter = 6.4008 meter and a hight of 6.096 meter.
The length of the vine is sqrt(6.4008^2 + 6.096^2) = 8.8388 meter (29 feet)
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