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Three circles of radius 4 cm are kept touching each other...

This question belongs to Arithmetic Ability Mensuration 2D
Mensuration 2D
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Three circles of radius 4 cm are kept touching each other. The string is tightly tied around these three circles. What is the length of the string?

Answer & Solution
Correct Answer: Option A
Mensuration 2D mcq question image
$$\eqalign{ & = 3 \times 2\sqrt {Rr} \cr & = 3 \times 2\sqrt {4 \times 4} \cr & = 24 \cr & = 24 + 2\pi r \cr & = 24 + 2\pi \times 4 \cr & = 24 + 8\pi {\text{ cm}} \cr} $$
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