Three circles of radius 6 cm are kept touching each other. The string is tightly tied around these three circles. What is the length of the string?
Answer & explanation
Correct answer: option 1
The length of the string not in contact with the circle = 2r + 2r + 2r = 6r = 6 × 6 = 36
Here,
The angles swiped by the string on one circle is 120.
Length of string touching circle = \(\frac{2πr }{3}\) + \(\frac{2πr }{3}\) + \(\frac{2πr }{3}\) =\(\frac{6πr }{3}\)
= 2πr = 2 × 6 × π = 12π
Total length = 36 + 12π