Question 1183412
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A sector with an angle 110 degrees at the center of a circle is cut away from a circular piece of paper 
of radius 70cm. The remaining part is folded to form a cone. Find 
1. the vertical angle of the cone 
2. The angle of the sector.
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This post by @CPhill is a copy-paste of the post by @mananth.


They both are very suspicious, because they both contain this phrase

"The area of major arc is the circumference of the base of cone".


As you see this gibberish, you should throw this solution to a garbage box 
immediately without any doubts - it does not deserve further consideration.


In addition, the solution in both their posts are incomplete.


In my post  (as @ikleyn)  at this spot,  I gave another,  fully correct and complete solution to this problem,
So,  you can disregard both posts by @mananth and by @CPhill.


Don't let them cloud your brain with flawed "quasi"-solutions.