Correct Answer: Option B

Explanation

diameter = 12cm

radius = \(\frac{12}{2}\)cm = 6cm

area of sector = 66cm²

area of sector = area of cone

66 = \(\pi rl\)

66 = \(\frac{22}{7} \times r \times 6\)

divide both sides by 6

11 = \(\frac{22}{7}r\)

22r = 11 x 7

r = \(\frac{77}{22}\)

= 3.5cm

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