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March Calender 23

I have used geogebra and proven that if there are 3 circles each with a radius of 1 that are all tangent to each other (as seen in the model), that a circle tangent to all the circles that encompasses all of the circle indeed has a radius of 2.15. You can see all the lines, points and circles I used to prove my theory. On Question 23 of the March Calender, I answered 2.15 and was given an incorrect. Correct me if I am wrong but my calculations are correct and accurate. I would greatly enjoy if you would please adjust the scoring on the March calender if my theory is correct. The question was "What is the radius of the larger circle" for reference. Thank you for your consideration.