Correct Answer: Option B

Explanation

Area 2\(\pi\)r2 + 2 \(\pi\)r(r + h)

= 2\(\pi\)r(r + h)

36\(\pi\) = 6\(\pi\)(r + h)

36\(\pi\) = 6\(\pi\)(3 + h)

36\(\pi\) = 18\(\pi\) + 6\(\pi\)h

36\(\pi\) - 18\(\pi\) = 6\(\pi\)h

Divide both side by 6\(\pi\)

h = 3cm

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