3.0cm
3.5cm
7.0cm
7.5cm
Correct answer is B
diameter = 12cm
radius = 122cm = 6cm
area of sector = 66cm2
area of sector = area of cone
66 = πrl
66 = 227×r×6
divide both sides by 6
11 = 227r
22r = 11 x 7
r = 7722
= 3.5cm
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