Multiple choice

The base radius of a cone is 7 cm and its curved surface area is 198 cm2. What is its slant height?

  1. 3 cm

  2. 2 cm

  3. 11 cm

  4. 9 cm
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D Correct answer
Explanation

The curved surface area of a cone is given by pi * r * l, where r is the radius and l is the slant height. Given 198 = (22/7) * 7 * l, we find 198 = 22 * l, so l = 198 / 22 = 9 cm.

AI explanation

The curved surface area of a cone is calculated as pi r l, where r is the radius and l is the slant height. Substituting the given values gives 198 = (22/7) multiplied by 7 multiplied by l. Solving this equation results in 198 = 22l, making the slant height 9 cm.

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