Three circles of radius 9 cm kept touching each other the string is tightly tied around the three circles what is the length of string?
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We only need to find the length of the red line and multiply it by 3.
The arc with 120º angle can be computed by:
Arc length = Circumference / 3
Arc length = (2πr) / 3 = (2*9*π)/3
Arc length = 6π
Total length of string = (6π + 18) * 3
Total length of string = 18π + 54
Total length of string = 110.55 cm
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