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I have forgotten how to answer this question

I have forgotten how to answer this question-example-1

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check the picture below.

so, as you see there, those radius make out an "equilateral triangle", and as you know, all angles in an equilateral triangle are 60° each.

now, if we make out the other equilateral triangle underneath that one, and add up the angles making out ∡CBD, you'd get, yes, you guessed it.
I have forgotten how to answer this question-example-1
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