Multiple choice

What is the total surface area of a cone where (r) is the radius and (l) is the slant height?

  1. $\(πr(l + r)\)$
  2. $\(2πr(l + r)\)$
  3. $\(πrl\)$
  4. $\(πrl^2\)$
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A Correct answer
Explanation

The total surface area of a cone includes the base (circle with area πr²) and the curved surface (πrl). Combined: πr² + πrl = πr(l + r). Option B incorrectly doubles this value. Option C is only the curved surface area without the base. Option D has an incorrect squared slant height.

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