SOLUTION: What is diameter of 3 circles that will fit into a 1 in. circle?

Question 1186559: What is diameter of 3 circles that will fit into a 1 in. circle?
Found 2 solutions by ikleyn, Alan3354:
Answer by ikleyn(52782) (Show Source): You can put this solution on YOUR website!
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Could you explain PLEASE what is "1 in. circle" in your post ?

Is it the circle of radius 1 or the diameter 1 ?

It is not a way to formulate Math problems as you do.

Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
What is diameter of 3 circles that will fit into a 1 in. circle?
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3 circles of radius r.
The centers of 3 circles in contact form an equilateral triangle.
The radius of the outer circle is the distance from the center of the triangle to the center of one of the 3 circles + r.
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