A cone problem - Math Central

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Question from Courtney, a student:

Hello,
I am having difficulty solving this cone problem. The biggest challenge I have is figuring out what angle they are talking about:
The angle at the base of a cone is 34.5 degrees. Find the diameter of the cone at point on the edge of the cone 26cm from the tip.

Hi Courtney,

I think it is angle BAC in my diagram.

cone

Write back if you need more assistance,
Penny

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