2cm
3cm
4cm
5cm
6cm
Correct answer is B
Area 2πr2 + 2 πr(r + h)
= 2πr(r + h)
36π = 6π(r + h)
36π = 6π(3 + h)
36π = 18π + 6πh
36π - 18π = 6πh
Divide both side by 6π
h = 3cm
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