Problem: A 6-inch and 18-inch diameter pole are placed as in the figure and bound together with wire. The length of the shortest wire that will go around them is:
Answer Choices:
A. 123​+16π
B. 123​+7π
C. 123​+14π
D. 12+15Ï€
E. 24Ï€
Solution:
The shortest length consists of the two external tangents ℓ and the two circular ares l1​ and l2​.
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