Track on a cone
The diagram illustrates a right circular cone-shaped mountain.
If you build a shortest distance track for a siteseeing train around the mountain, in which the track starts at point and ends up at point , the track will first go uphill, but then it will go downhill.
What is the length of the downhill track?
The problem is from the Korean SAT, CSAT
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1 solution
A solution is posted from Presh Talwakar, the owner of the YT channel Mind Your Decisions
Click here