If the slant height and radius of a right circular cone are 28 cm and 21 cm, respectively, then the total surface area of the right circular cone (in cm2) is:
(Take π = 22/7)
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e.3234.
Total surface area = πr(l + r)
= (22/7) × 21(28 + 21)
= 66 × 49
= 3234 cm2