Math CentralQuandaries & Queries


Question from Dimaris, a student:

The radius of the outer circle of 2 concentric circles is x. An equilateral triangle inscribed in the outer circle also circumscribes the inner circle. What is the radius of the inner circle in terms of x?

Hi Dimaris,

I can help you get started.

circles and triangle

In my diagram the length of BC is x. What are the measures of the angles in triangle ABC?


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