In the following question, two statements, (i) and (ii), are given. Choose the valid statement. i. The total surface area of a sphere is 154 cm2. Its radius will be 7 cm. ii. For a cone; h2 = l2 + r2.

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Neither (i) nor (ii) Explanation: • Statement (i) is invalid because a total surface area of 154 cm2 corresponds to a radius of sqrt((154 $\times$ 7)/(4 $\times$ 22)) = 3.5 cm, not 7 cm. • Statement (ii) is also invalid because the correct relationship between the dimensions of a cone is given by Pythagoras' theorem as l2 = h2 + r2, which means h2 = l2 − r2

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