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The diagram that u have foresighted is wrong . As in the solution u have mentioned the radius to be 2 cm, but thats not possible from the diagram and more over the cone is not symmetric .

I am not an expert in Number Theory. However, I know dozens of interesting (and often obscure) theorems and formulas which makes me LOOK like an expert.

38 years teaching college-level math, mostly at a two-year college.**Education/Credentials**

BS and MS in mathematics, SUNY Albany