Multiple choice

Calculate the total surface area of the cone if the radius of the base is 5m and slant height is 13m?

  1. 57.89

  2. 292.76

  3. 282.85

  4. 275.46

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Total surface area of a cone = πr(r + l), where r is the radius and l is the slant height. Given r = 5m, l = 13m: TSA = π × 5 × (5 + 13) = π × 5 × 18 = 90π = 90 × 3.14159 ≈ 282.74. This matches option C (282.85, allowing for π approximation).

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