In the following question, two statements, (i) and (ii), are given. Choose the valid statement. i. The circumference of the base of a cylindrical vessel is 132 cm. Its diameter will be 21 cm. ii. Total surface area of a hemisphere = 3$\pi$r2.

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Only (ii) Explanation: Statement (i) is invalid because a circumference of 132cm gives a diameter of (132 $\times$ 7)/(22) = 42 cm, not 21 cm. Statement (ii) is valid because the total surface area of a solid hemisphere is correctly given by the standard formula 3$\pi$r2.

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